A built in dark mode for web pages already exists in Firefox for iOS and iPadOS (the “Turn on Night Mode” button in the menu). It’s very fast and doesn’t slow down heavy websites like Google Maps (unlike extensions such as Dark Reader). My only compl...
They are working on making offline translation possible - here's an article from May 2021: https://www.ghacks.net/2021/05/29/mozilla-integrates-firefox-translations-into-firefox/The GitHub repo is still being worked on and you can find installation i...