Tabber
Save your groups of tabs so you can restore them later in a new window. You can edit saved tabs groups by adding, deleting or changing the url for each tab.
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Simple Discard Tab
Discards tabs that are inactive for 3 minutes to free up memory, while still preserving the tabs state when you click on them again. No privileged permissions required.
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Import URLs (as Bookmarks or Tabs)
Import URLs from the clipboard or a text file and opens them as loaded or unloaded tabs or save them as bookmarks
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MPT Hide Browser UI
Makes the Browser Open without Browser UI (address bar, toolbar, etc.).
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The Browser Lock
DO NOT USE WITHOUT YOUR ORGANIZATION'S AUTHORIZATION. It alerts users not to lose data when they use Smartsheet Forms, Google Forms, and Microsoft Forms.
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SuperStart New Tab Page
A Firefox Extension that lets you create a customized Start Page Experience
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Multi-Account Container Tabs
Creates a menu to only shows the tabs of the selected container.
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SoundTuner
Extension to manipulate background audio. Can lower/increase volume, add pan and mono per tab. Can also save background sounds per website for future visits.
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Tab Limiter
Limit the number of tabs a given window can have (i.e. set a maximum number of tabs on a per-window basis) and automatically open additional tabs in a different window.
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Activate Left Tab On Close
When the currently active tab is closed, always switch to the one on the left of it.
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