Suddenly from one moment to the next onetab page no longer loads: I have been using the extension for a while. I have not experienced issues in the past, but last week Thursday the Onetab page grouping all my saved pages would no longer load. It worked in the morning, then in the afternoon the developer console returned an "Uncaught (in promise) undefined" for that page. I see the loadingspinner going and going. Backed up my FF profile folder just in case and then tried different ways like clearing cache/history, removing/re-adding the extension...to no avail Very frustrating. It would really be amazing if there were a backup I could extract the tabs from. But it seems like it all is scrambled into a file I can't decode.
I read the other users' frustrating comments and must say, if it is this instable, I will not use it moving forward nor recommend it.