The latest FF update 55.0.2 doesn’t have the Restore Previous Session option on it. Will that be added or is it just gone?
I can’t help with the specific problem, but you probably don’t realize what’s going to happen with Release 57.
All “legacy” add-ons will stop working at that time.
This will include Classic Theme Restorer, which I’m pretty sure you use.
For an extended discussion see Mozillazine site.
(I tried to include link but it didn’t work, which
somehow didn’t surprise me!)
Why would they do that? I have been trying to find some add-ons to replace some of the Legacy extensions because ALL of my extensions have the yellow Legacy on them. I have found only 2 so far! Hopefully some of the popular add ons will be upgraded to work. If not, I think a lot of people will NOT update to 57. I wish I hadn’t updated to 55.0.2.