The worst add-on I had on my system for months. Had the same running in Chrome, where it works quite well. On Firefox (72.01, 64 bit) win7 64 pro, it let me lose more than 250 tabs collected over a long time. Hope to retrieve them in my backups, but this add-on should be taken of the list immediately. One star is still one too many.
If the developers want to keep a small fraction of credibility, they should publish a method how to retrieve the lost tabs yet today.

I like it, but there are few issues I encounter:
1. doesn't play well with multi-account containers, so my tabs forget which container they were opened in.
2. Clicking the onetab button is a very bad UX. It should take me to onetab or open a menu rather than converting all my tabs and taking me a while to restore the mess it made (see 1).
3. Right clicking to get through several layers of menus to convert a single tab is a bad UX. Please give the option to right click on the tab itself to convert just that tab.

Totally screwed my tabs and session on FF Android.
FU OneTab, specify if you know it's not working on Android.

An absolute must-have for my desktop, One Tab helps keep my tabs from going crazy and assassinating my ram. I love it, and it's the second addon I install on desktop. Sadly, it's less great on mobile, with old one-tab pages continuing to reload every time u start the browser, but I adore it on desktop.

It's OK. as long as all of the tabs are loaded in Firefox (not asleep), this extension will suspend them to the mobile browser; for this I'd recommend a feature that refreshes all Firefox mobile tabs, if that is possible. My one biggest gripe is that it is lacking many features from the desktop version, such as the option to not open onetab at startup. Please add these, as it is really annoyong having the onetab page pop up whenever I open a link in Firefox.