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It's still possible to install SingleFile [1] on Firefox Nightly but you will need, for example, another browser to display saved pages [2].

[1] https://addons.mozilla.org/firefox/addon/single-file/

[2] https://github.com/mozilla-mobile/fenix/issues/7546

My routine is send the tab to a PC device and do it there later. I love Firefox Sync so much I think I might just host my own backend server for it some day.

I would love Firefox Sync too, but a lot of times it just doesn't send the tab I wanted (I always fallback to checking what is open on my other browser).

You need to re-sync in your PC side then it will show the tabs that you sent. I had issues with FF Sync with not appearing on the other side. It is usually that Firefox haven't start the syncing that you have to tell it to sync now.

If you are using Android, disable the battery optimization on Firefox in Android setting.

I'd like to be able to open PDFs with Firefox and search the contents for a string.

I tried this a week or so ago and don't think it is.