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Open Tabs Next to Current No Restart

Open new tabs always to the right of the current one.

Rated 5 out of 5 stars (18)
3,823 users

Pin Unpin Tab No Restart

Pin or unpin current tab through new, cooler ways:
1. Customizable keyboard shortcut. Default is Alt-P
2. Firefox Developer Command line -> 'pintab' & 'unpintab'

UPDATE: Commands don't work anymore. They are disabled from version 1.0.

Rated 4 out of 5 stars (10)
1,050 users

Custom UserAgent String No Restart

Add a custom useragent string for desired URLs or domains.

Rated 4 out of 5 stars (5)
4,205 users

Downloads in Tab

Opens "Downloads" manager in tab from Tools menu or automatically when a download starts (default). See Options for more choices.

Rated 4 out of 5 stars (122)
7,407 users

Open in IE™ (Internet Explorer) No Restart

Open links in Internet Explorer

Rated 3 out of 5 stars (1)
3,141 users

Stratiform

Stratiform is the ultimate user friendly customization add-on for Firefox. It puts the power in the average user's hands to customize the browser's look.

Rated 5 out of 5 stars (180)
6,161 users

Tab Tree No Restart

Tab Tree shows your tabs in the form of a tree structure. And also makes the user interface compact (optionally) to allow more space for the Web.

Rated 4 out of 5 stars (98)
7,707 users

Open about:permissions

Firefox 6 introduces new Permissions Manager which you can find under URL "about:permissions". This add-on adds link to the menu where you cannot find link to this manager at this moment.

Rated 5 out of 5 stars (1)
16,801 users

Session Sync No Restart

Save sessions as bookmarks and sync them through Firefox Sync.
Manage, edit, save, restore.
Session-Sync will automatically detect updates and display updated sessions across multiple machines.

Rated 5 out of 5 stars (16)
1,664 users

Load Tab on select No Restart

Stops background tabs from loading until you select them.

***New Version***
https://addons.mozilla.org/firefox/addon/load-tab-on-select/versions/0.5.8

Rated 4 out of 5 stars (27)
2,107 users

Office-Online No Restart

A basic office online addon

Rated 3 out of 5 stars (5)
1,693 users

TubeCast No Restart

For those that have smart TV's and use the great TubeCast application available on Windows 10.

Rated 5 out of 5 stars (1)
5,299 users

Owl - For comfortable reading No Restart

An add-on to make online reading easy.
This add-on makes reading comfortable by dimming the background and transforming the theme of the page into a darker one.

Rated 4 out of 5 stars (20)
2,118 users

Moment

Keep up with time.

A minimalist clock on the new tab page showing the current time, date, and weather. Both the background colour and the text colour are fully customizable.

Rated 4 out of 5 stars (25)
2,480 users

Simplified Tab Groups No Restart

A Firefox addon that provides tab grouping features similar to the removed TabView/TabGroups/Panorama features with a different UI. This add-on is able to manage tab groups created by Panorama.

Rated 5 out of 5 stars (21)
2,128 users

Thin Tabs No Restart

Extremely thin tabs optimized for the squared variants of Classic Theme Restorer.

I fear it will look awful with the default Australis tabs, so be warned.

With version 1.1 an option dialog with various customization options has been added.

Rated 4 out of 5 stars (10)
1,399 users

Open With Opera No Restart

Open With Opera sends pages, links, tabs and images from Mozilla Firefox to Opera.

Rated 5 out of 5 stars (4)
1,333 users

Window Master No Restart

Functionality for multiple screens and windows. Easily open links in other windows or on other screens, move or merge tabs, and move or merge entire windows. With graphical controls for grid positioning.

Rated 4 out of 5 stars (10)
2,218 users

Session Exporter

Exports Firefox sessions to HTML files or saves them to your bookmarks. If your session includes tab groups, your tabs are grouped accordingly.

Rated 5 out of 5 stars (10)
2,596 users

All Tabs Helper

Transforms "List all tabs" menu to do closing, loading, unloading, moving of single/multiple tabs. Search tab titles or *content* (remember "Find In Tabs"?), visited tabs history, find duplicate tabs - very helpful for mega-tab users. And more...

Rated 5 out of 5 stars (64)
5,610 users