Firefox Advanced Youtube Search Add-on - Sort Criteria

The following extension adds a menu item to the right-click menu that enables you to search for the selected text with specified sort criteria - Relevance, Upload Date, View Count, Rating.

Create a folder named search_youtube_sort and add the following manifest.json and search_youtube_sort.js files to this folder.

Go to about:debugging in Firefox and click Load Temporary Add-on and load the manifest.json file. Then right-click on the selected text on a webpage and choose the sort criteria to search in Youtube.