Useful about:config settings

Here you can find some useful settings to change in About:config page.

The most relevant to note should be:

Enable the use of userChrome.css and userContent.css -> toolkit.legacyUserProfileCustomizations.stylesheets to true

Most of the functions of TMP can be replaced with CSS or JS like multi-row tabs, keep the close button on tabs always visible, focus tab on hover, and color-coding tabs when they are loaded, unloaded (CSS Tweaks section, inside Tab-related-Tweaks.css), or through extensions like Tab Session Manager and Undo Closed Tab. For the ones that can't, here are some about:config settings that fix a few of them:

To keep FF open even after closing the last tab -> browser.tabs.closeWindowWithLastTab to false.
To open a search result typed on the URL bar on a new tab -> browser.urlbar.openintab to true.
To open a search result typed on the search bar on a new tab -> browser.search.openintab to true.
To open bookmarks on a new tab instead of the current tab -> browser.tabs.loadBookmarksInTabs to true.
To force popups on new tabs instead of windows -> browser.link.open_newwindow.restriction to 0 (should be 2 by default).
Open related tabs (the ones you open) as the last tab in the tab bar -> browser.tabs.insertRelatedAfterCurrent to false.

Disable "Enable remote debugging" prompt when accessing the browser developer tools -> devtools.debugger.prompt-connection to false
Opened new tabs to appear at the end of the tab list (instead of next to current active tab) -> browser.tabs.insertRelatedAfterCurrent to false
Disable reader mode -> reader.parse-on-load.enabled to false
Disable Pocket -> extensions.pocket.enabled to false
Enable ICC v4 color management -> gfx.color_management.enablev4 to true
Enable color management everywhere -> gfx.color_management.mode to true

If you have an SSD and want to change the cache folders somewhere else, you should add these settings with the new path:

These are all telemetry related.

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