It was until a recent Chrome update for Android that they took out the ability to turn the webpages dark within the hidden settings, and that was what motivated me to go back to Firefox (first time user on Android though).
I haven't looked back, and am actually not sure if they brought the feature back, nor that I care nowadays ;).
I tried dark reader in Firefox on Android but felt it was slowing down website rendering too much. I switched to Dark background and Light Text which is faster.
I almost dumped Firefox on Android for Chromium based one due to this reason before realising the culprit, many sites were super sluggish and FF often lost cache when I changed between apps.
I am now just using the built in setting, many sites have native dark mode and the ones that don't - I realised it does not bother me too much.
I don't see the value in using an extension just to automatically watch YouTube in HD. Maybe 10 years ago, but now we got Newpipe.
Also Google Search has gone downhill for quite some time now. Why should I install an extension that reverts the enshittification Google has deliberately created?
DDG, Qwant, searXNG maybe even Brave or Kagi are better options. If you like Google Search so much, at least use Startpage.
It is a metasearch engine, so you can tweak the sources of the results, default language, etc. I personally use all the default plus some more engines and all languages, then reduce results if I can't find useful information. It has made searches easier for me, since you can find all types of information with just one click (Search | Images | Files | Academic | etc.) and multiple languages, but it can be not so welcoming to people that want simple searches.
I was skeptical about DeArrow but it is absolutely worth it. I don't use the thumbnail replacer but removing clickbait titles makes YouTube so much more usable.
Yes. I have like 1.5GB of just HTML files created using it. I find important bits throughout the internet as a data archivist/historian and save it all.