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All Tabs Helper

(Note: ATH versions >= 1.1.1 will not work on Firefox versions < 58.)

Summary

This addon provides a list-style UI for tab management. Designed mainly for high-volume tab users.

The ATH UI can be accessed 3 ways: From the toolbar button popup, in the sidebar, or in the management window (aka "full view" window). Each UI provides 4 different views, also referred to as "menus":

all - All tabs are displayed in tabs bar order, or can be filtered by title and url by typing in the search box.

recent - Lists tabs in order from most recently accessed first.

dups - Duplicate tabs are displayed. (See caveat*)

search - Tabs can be searched by tabs content of loaded tabs.

The screenshots and captioned instructions give a good introduction to using ATH.

Note that ATH is window-centric, ie, menu only applies to the window it is in. The only cross-window support is the ability to move multiple tabs across windows. Demonstration for this is also shown in the screenshots.
(EDIT: ATH now has multi-window functionality, however it is experimental and currrently considered "unsupported". Must be enabled in Options.)

*caveats:

Dup tabs - Note that dup tabs list is generated by searching for tabs with identical URLs. It is possible for two tabs to have the same URL but different content, eg the case where the page is generated based on form or cookie data. Use with awareness when removing tabs.

Reasons for permissions:

Access your data for all websites - Listing and searching tabs - used for the highlighting within the page that is used in the "Search all tabs" feature when the user clicks on a search result in the ATH UI.

Read and modify browser settings - ATH option "Open new tab next to current" changes FF pref

Read the text of all open tabs - Searching tabs content ("search" menu)

Access recently closed tabs - Used to store data that is window oriented, such as window title names

Access browser tabs - Listing and searching tabs

(Note: To be clear, ATH does not modify any part of any page for spoofing, nor scavenge any user input, in order learn any user information, including but not limited to passwords etc.)

Note for Legacy Firefox users: I am making a few concessions to allow ATH to run on Firefox 56 (the last legacy version.) I'd like to make it clear that I am officially not supporting Firefox 56. Some features will not work, or be inapplicable, due to the lack of APIs in Firefox 56. I have only made attempts to allow what will work to work, without breakage, however I am not taking the time to make a customized UI. Thus you may find options, features or context menu items listed that won't apply to you. You may also find bugs which won't be fixed.

In this same paradigm, I cannot guarantee that all future updates of ATH will continue to work on Firefox 56 (or variants.) To be safe you may want to turn off automatic updates and only do updates where you can monitor which is the last version that will work for you.

Install
Moving tabs using context menu. Select tabs by ctrl/cmd/shift + click, place cursor over target point, then click ATH menu can be opened in the sidebar as well. Or use default ctrl/cmd + shift + 9 (can be customized in Options) For drop-down view, click on the toolbar icon. Or use default ctrl/cmd + shift + 8 (can be customized in Options) Although cross-window features are not strongly supported, you can move tabs between windows. Select tabs, r-click, click Filter tabs in In the Find duplicate tabs (beware, ATH determines this by comparing titles and urls. In some cases tabs may have the same title and url but have different content) Group like tabs together: 1) Scattered MDN tabs I want to group 2) Filter for ATH has optional dark mode Full View Window (shown in dark mode) provides an array view of tabs for easier organization when there are large numbers of tabs. Open from context menu > Full View Window, or use default ctrl/cmd + shift + 0 (can be customized in Options) Moving tabs by drag and drop. For single tabs, just click and drag. For moving multiple tabs, select tab(s) by ctrl/cmd + click then drag. You can also use shift + click to select a range. Get more information on the tab by hovering over the icon. Shows index number, full title and full URL. Preferences - Behavior Preferences - Full View Window Preferences - Keyboard Shortcuts - allows customization of shortcuts Preferences - Actions - Recent tabs history can be reset from this panel Preferences - Appearance Preferences - Custom CSS - for advanced users, allows custom styling of menus