Browser extensions
Chrome
Reverse image search for multiple services
Allows quick archiving of pages, and automatically checks for archived versions of 404 pages
Save and edit groups of browser tabs for later use
Direct access to Google Translate. Allows translation of whole pages
Access to a suite of tools useful in the verification process (A caveat with the 'Analysis' tab: The time function currently has a problem where it is failing to identify a video that is set as Private or Unlisted. If the video is later set to Public, InVid is incorrectly showing the time this happened as the upload time).
Allows simultaneous keyword searches across multiple platforms. Multilingual.
Firefox
Reverse image search for multiple services
Allows quick archiving of pages, and automatically checks for archived versions of 404 pages
Save and edit groups of browser tabs for later use
Direct access to Google Translate. Allows translation of whole pages
Access to a suite of tools useful in the verification process
If you're unfamiliar with adding plugins to Firefox, there's a simple guide here.
(* Note that the Firefox version has the same issue with YouTube video as the Chrome version)