Tab Numbers by piyush

A lightweight Firefox extension that displays [1]-[9] prefixes in tab titles for easy keyboard navigation using Ctrl+Number.

Features:
✅ Clear, readable [1] Page Title format
✅ Supports tabs 1-9 (matches Firefox's Ctrl+N shortcuts)
✅ Includes pinned tabs in numbering
✅ Cross-window tab dragging support
✅ Automatically renumbers when tabs are moved, closed, or created
✅ Privacy-focused: No data collection, no network requests

Installation
From Firefox Add-ons (Recommended)

Github Repo for the code: https://github.com/piyushjain9399/firefox-tab-numbers
How It Works
The extension uses Firefox's scripting.executeScript() API to modify document.title on each tab. It listens to all tab events (created, removed, moved, attached, detached) to keep numbers synchronized.
Keyboard Shortcuts
Shortcut Action
Ctrl+1 Switch to tab 1
Ctrl+2 Switch to tab 2
... ...
Ctrl+9 Switch to tab 9

Note: These are Firefox's built-in shortcuts - the extension just makes it easier to identify which tab corresponds to which number!

Known Limitations
- Some tabs cannot display the number prefix due to Firefox's security model:
- about: pages (settings, debugging, etc.)
- moz-extension:// pages
- Firefox's built-in PDF viewer
- New Tab page
These tabs will still work with Ctrl+N shortcuts - they just won't show the [N] prefix.

Privacy
This extension:
✅ Only reads tab titles and positions
❌ Does NOT access URLs or browsing history
❌ Does NOT store any data (locally or remotely)
❌ Does NOT make any network requests

Permissions required:
tabs - Read tab titles and positions
scripting - Modify tab titles via document.title
<all_urls> - Required for scripting.executeScript() to work on web pages

Requirements
Firefox 140 or later

License
MIT License - feel free to use, modify, and distribute!

Contributing
Contributions are welcome! Feel free to open issues or submit pull requests.