To get legacy add-ons, download the classic archive XPI from GitHub.The legacy add-ons that I use that aren’t usable in Firefox are Simple Add-On Manager (it lets you enable/disable extensions, themes, and plug-ins easily), Chrome Store Foxifed (converts Chrome CRX extensions into Firefox XPI extensions), and BarTab Plus (automatically unloads inactive tabs). Waterfox is a fork of FIrefox that works with legacy add-ons and most current Firefox add-ons in the Firefox store.Brave and Vivaldi don’t have their own add-on stores, but you can download any extensions in the Chrome store like you would in Chrome without having to do anything beforehand.

To download Chrome extensions all you have to do is download this extension. Opera has it’s own add-on store along with the capability to download Chrome extensions.Notes for Opera, Brave, Vivaldi, Waterfox, and Ungoogled Chromium:

For any extensions that have to do with downloading videos, see my Video Downloaders post that includes not just extensions, but also download managers, websites, and more. The browsers I’ve used are Opera(& Opera GX), Firefox, Brave, Google Chrome, Ungoogled Chromium, Microsoft Edge, Vivaldi, and Waterfox.

Ublock origin opera gx android