Agent skill

Firefox

Control Firefox browser on macOS: open URLs, close/switch tabs, get active tab info, focus Firefox, send keystrokes.

MITAuto-check passed

Install Firefox

skills CLI

$ npx skills add meain/dotfiles --skill firefox -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install meain/dotfiles firefox --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/meain/dotfiles.git skills-src && mkdir -p .claude/skills && cp -r skills-src/agents/.agents/skills/firefox .claude/skills/firefox && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "firefox" agent skill from https://github.com/meain/dotfiles/tree/master/agents/.agents/skills/firefox into .claude/skills/firefox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firefox", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/meain/dotfiles/tree/master/agents/.agents/skills/firefox

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add meain/dotfiles --skill firefox -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install meain/dotfiles firefox --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/meain/dotfiles.git skills-src && mkdir -p .agents/skills && cp -r skills-src/agents/.agents/skills/firefox .agents/skills/firefox && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "firefox" agent skill from https://github.com/meain/dotfiles/tree/master/agents/.agents/skills/firefox into .agents/skills/firefox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firefox", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add meain/dotfiles --skill firefox -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install meain/dotfiles firefox --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/meain/dotfiles.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/agents/.agents/skills/firefox .cursor/skills/firefox && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "firefox" agent skill from https://github.com/meain/dotfiles/tree/master/agents/.agents/skills/firefox into .cursor/skills/firefox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firefox", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/meain/dotfiles.git --path agents/.agents/skills/firefox

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add meain/dotfiles --skill firefox -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install meain/dotfiles firefox --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/meain/dotfiles.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/agents/.agents/skills/firefox .gemini/skills/firefox && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "firefox" agent skill from https://github.com/meain/dotfiles/tree/master/agents/.agents/skills/firefox into .gemini/skills/firefox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firefox", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install meain/dotfiles firefox

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add meain/dotfiles --skill firefox -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/meain/dotfiles.git skills-src && mkdir -p .github/skills && cp -r skills-src/agents/.agents/skills/firefox .github/skills/firefox && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "firefox" agent skill from https://github.com/meain/dotfiles/tree/master/agents/.agents/skills/firefox into .github/skills/firefox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firefox", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add meain/dotfiles --skill firefox -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install meain/dotfiles firefox --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/meain/dotfiles.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/agents/.agents/skills/firefox .opencode/skills/firefox && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "firefox" agent skill from https://github.com/meain/dotfiles/tree/master/agents/.agents/skills/firefox into .opencode/skills/firefox/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "firefox", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: firefox
GitHub stars: 285
Token cost: ~991 tokens
SKILL.md length: 180 words
Files: 1
Skills in repo: 36
Repo updated: Sep 5, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Control Firefox browser on macOS: open URLs, close/switch tabs, get active tab info, focus Firefox, send keystrokes.

Asked to open a link in Firefox
SKILL.md covers What works / doesn't, Snippets and Important: always confirm…
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Switch to a tab

What it does

Firefox is an agent skill from meain/dotfiles. Control Firefox browser on macOS: open URLs, close/switch tabs, get active tab info, focus Firefox, send keystrokes. Use when asked to open a link in Firefox, close a tab, switch to a tab, find what's open in Firefox, or automate any browser action.

Its SKILL.md is about 990 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with macOS. The repository describes itself as: If there is a shell, there is a way! The licence is MIT.

When your agent uses it

Asked to open a link in Firefox
Switch to a tab
Find whats open in Firefox
Automate any browser action

Example prompts

“/firefox”

What it can do on your machine

Read from SKILL.md and the folder at commit f469fb6. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are applescript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Firefox loads about 991 tokens when it runs. Until then it costs about 64 tokens; SKILL.md has 180 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~64
When it runs · the whole SKILL.md, loaded when a task matches: ~991

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from meain/dotfiles at commit f469fb6, republished under its MIT licence (© meain). 180 words, ~991 tokens.

Download SKILL.mdSave it as .claude/skills/firefox/SKILL.md (or your agent's skills folder).

name: firefox
description: Control Firefox browser on macOS: open URLs, close/switch tabs, get active tab info, focus Firefox, send keystrokes. Use when asked to open a link in Firefox, close a tab, switch to a tab, find what's open in Firefox, or automate any browser action.
user_invocable: true

Firefox Control

Automate Firefox via AppleScript + System Events UI scripting.

All osascript calls require dangerouslyDisableSandbox: true.

What works / doesn't

Works natively:

Open a URL (new tab)
Get active tab title per window
Close a window
Window properties (bounds, visibility, minimize)
Activate/focus Firefox

Works via UI scripting (System Events):

Close current tab (Cmd+W)
Switch to a tab by name (%<query> in address bar)
Get current tab URL (Cmd+L → select all → copy)
Any keyboard shortcut / menu item

Does NOT work:

Enumerate all tabs in a window (Firefox doesn't expose tabs as AppleScript objects)
Get URLs without focusing the tab first

Snippets

Open a URL

applescript

tell application "Firefox"
  activate
  open location "https://example.com"
end tell

Get active tab titles (one per window)

applescript

tell application "Firefox"
  set names to {}
  repeat with i from 1 to (count windows)
    try
      set end of names to (i as string) & ": " & name of window i
    end try
  end repeat
  return names
end tell

Close a window by index

applescript

tell application "Firefox"
  close window 2
end tell

Get current tab URL

applescript

tell application "Firefox"
  activate
end tell
delay 0.3
tell application "System Events"
  tell process "Firefox"
    keystroke "l" using command down
    delay 0.3
    keystroke "a" using command down
    delay 0.1
    keystroke "c" using command down
    delay 0.2
  end tell
end tell
do shell script "pbpaste"

Switch to a tab by name / URL fragment

applescript

-- Uses Firefox's built-in tab search: type "% <query>" in address bar
-- Must open a new tab first so the address bar is focused and ready
tell application "Firefox"
  activate
end tell
delay 0.5
tell application "System Events"
  tell process "Firefox"
    keystroke "t" using command down  -- open new tab (address bar auto-focused)
    delay 1
    keystroke "% YOUR_QUERY_HERE"
    delay 1.5
    key code 125  -- arrow down to first result
    delay 0.5
    key code 36   -- Enter to switch
  end tell
end tell

Close a tab by URL fragment

applescript

-- Open a new tab, search for the tab, switch to it, then close it
tell application "Firefox"
  activate
end tell
delay 0.5
tell application "System Events"
  tell process "Firefox"
    keystroke "t" using command down
    delay 1
    keystroke "% YOUR_QUERY_HERE"
    delay 1.5
    key code 125  -- arrow down to first result
    delay 0.5
    key code 36   -- Enter to switch to the found tab
    delay 0.8
    keystroke "w" using command down  -- close it
  end tell
end tell

Close the current tab

applescript

tell application "Firefox"
  activate
end tell
delay 0.2
tell application "System Events"
  tell process "Firefox"
    keystroke "w" using command down
  end tell
end tell

Send any keyboard shortcut

applescript

tell application "Firefox"
  activate
end tell
delay 0.2
tell application "System Events"
  tell process "Firefox"
    keystroke "r" using command down  -- e.g. Cmd+R to reload
  end tell
end tell

Important: always confirm before closing

Before closing any tab or window, confirm with the user which one to close. Prefer identifying by title. Never assume which window index is which without first listing window names.

To identify windows before acting:

applescript

tell application "Firefox"
  set names to {}
  repeat with i from 1 to (count windows)
    try
      set end of names to (i as string) & ": " & name of window i
    end try
  end repeat
  return names
end tell

Files

Just SKILL.md in agents/.agents/skills/firefox of meain/dotfiles.

Open the folder on GitHubat commit f469fb6

Compare with similar skills

Firefox next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Firefox compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Firefox this skillmeain/dotfiles	285	—	~991	Automated safety check: Pass	MIT	1 mo ago
Site ArchitectureAvdLee/RocketSimApp	802	10 repos	~3.3k	Automated safety check: Pass	Custom licence	yesterday
macOS Spm App PackagingDimillian/Skills	4k	5 repos	~1.2k	Automated safety check: Pass	MIT	6 mo ago
Orca iOS Simulator Controlstablyai/orca	87k	1 repos	~584	Automated safety check: Pass	Apache-2.0	today
Mole Bug Patternstw93/Mole	69k	—	~2k	Automated safety check: Pass	GPL-3.0	today
Disk Storage AnalyzerKKKKhazix/khazix-skills	21k	1 repos	~1.4k	Automated safety check: Pass	MIT	6 days ago

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Questions about Firefox

What does Firefox do?

Control Firefox browser on macOS: open URLs, close/switch tabs, get active tab info, focus Firefox, send keystrokes. Firefox is an agent skill from meain/dotfiles. Control Firefox browser on macOS: open URLs, close/switch tabs, get active tab info, focus Firefox, send keystrokes.

When should I use Firefox?

Firefox fits situations like: asked to open a link in Firefox; switch to a tab; find whats open in Firefox; automate any browser action.

How do I install Firefox in Claude Code?

Run `npx skills add meain/dotfiles --skill firefox -a claude-code`. Or copy the skill folder (agents/.agents/skills/firefox in meain/dotfiles) into .claude/skills/firefox in your project. Claude Code loads it when a task matches its description.

How do I install Firefox in Codex?

Run `npx skills add meain/dotfiles --skill firefox -a codex`. Or copy the skill folder (agents/.agents/skills/firefox in meain/dotfiles) into .agents/skills/firefox in your project. Codex loads it when a task matches its description.

Can I use Firefox in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add meain/dotfiles --skill firefox -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/firefox, .gemini/skills/firefox, .github/skills/firefox and .opencode/skills/firefox in your project.

What does Firefox need to run?

SKILL.md names no scripts, command-line tools or credentials: Firefox is instructions for the agent only.

Does Firefox access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Firefox safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Firefox use?

Firefox is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Firefox use?

About 991 tokens (SKILL.md is roughly 4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Firefox?

Skills that share tags, products or a category with Firefox: Site Architecture (AvdLee/RocketSimApp, 802 stars), macOS Spm App Packaging (Dimillian/Skills, 4k stars), Orca iOS Simulator Control (stablyai/orca, 87k stars) and Mole Bug Patterns (tw93/Mole, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Firefox?

meain (a GitHub user) maintains it in meain/dotfiles, which has 285 GitHub stars. The repository holds 36 skills in this directory. The repository was last updated on September 5, 2026.

Source: meain/dotfiles on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Firefox

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Firefox Control

What works / doesn't

Snippets

Open a URL

Get active tab titles (one per window)

Close a window by index

Get current tab URL

Switch to a tab by name / URL fragment

Close a tab by URL fragment

Close the current tab

Send any keyboard shortcut

Important: always confirm before closing

Files

Compare with similar skills

Similar skills

More from meain/dotfiles

Related

Questions about Firefox