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Grasshopper

This is meant to complement or even replace the tab bar.

It's a tab manager but also supports History, Bookmarks, and more.

It can be used as a popup or on the sidebar.
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Why the permissions?

- Tabs: To be able to query and update tabs.
For example to make tabs pinned or muted.
To move, open, close tabs.

- History: To get the recent history.
There's a History mode.
(History is not modified or deleted).

- Bookmarks: To get the bookmarks.
There's a Bookmarks mode.
(Bookmarks can be added but not deleted).

- Sessions: To get the recently closed tabs.
There's a Closed mode.
(Last 25 closed tabs. These can be forgotten).

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Features:

Shows a list of open tabs.
Tabs update in real time.
Filter tabs by typing.
Pin tabs.
Close tabs.
Show pins or playing tabs.
Filter by title or URL.
Re-open recently closed tabs.
Show tab titles or urls.
Clean (close all tabs except pins).
Go to tabs playing audio.
Go to last visited tabs.
Open new tabs.
Mute/unmute tabs.
Search and filter the history.
Change the color theme.
Customize the interface.
Filter images, videos, audio.
Unload tabs.
Filter by unloaded tabs.
Move tabs to other windows.
Show tab information.
Filter similar tabs.
Filter by duplicates.
Close duplicates.
Move tabs to top or bottom.
Customizable mouse gestures.
Command palette.
Custom filters.
Option to have a single new tab.
Edit URL profiles to add tags, notes, titles, and colors.
Regex support in filter.

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Favicons:

Right now Firefox does not allow access to the favicons cache, in some cases.
Tabs and Closed do have local favicons but History, and Bookmarks don't.
To allow the use of favicons in these cases, network requests are made to a service.
This can be enabled in Settings.

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Shortcuts:
- Ctrl + Space = Toggle popup
- Ctrl + Shift + Space = Toggle sidebar

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Recommended userChrome.css:

1) Go to about:config

2) Enable: toolkit.legacyUserProfileCustomizations.stylesheets

3) Find the profile directory, you can see that path in about:profiles

4) Create chrome/userChrome.css in it

5) Add this to that file and save it:

#TabsToolbar {
visibility: collapse !important;
}

#sidebar-header {
display: none !important;
}

#sidebar-search-container {
display: none !important;
}

#sidebar-splitter {
width: 2px !important;
}

6) Restart Firefox

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Chrome?

There's currently no Chrome version. Chrome has no sidebar API, and even then, porting it requires modifying some of the code. And some things don't work the same. So no Chrome version for now.

Install
This is in popup mode This is in sidebar mode