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Today 10 years ago I got a Firefox OS phone
(jemmy.jeena.net)
This is a most excellent place for technology news and articles.
Once Firefox lost session manager and downthemall, it was dead to me.
Nowadays I use edge. All the benefits of chrome plus it's leaner.
I use kiwi browser on phones for the addons, and because it's faster than Firefox
I haven't looked into those specifically, but I'm pretty sure there are alternatives that do the exact same things for FF
I use Tab Session Manager and Session Sync add-ons with Firefox and I'm quite happy with them.