Here is what I have learned after following the guidance in your May 28 & May 29 posts.
Make sure not to miss any steps! It had been March since I opened FEBE before my May trials. With the screenshots I showed in those two May posts, I forgot to execute the last step: Tools->FEBE->Perform Backup Now. After adding that step, I am able to receive the Results Report.
I 1st chose Selective' and backed up only the extensions and themes. That worked fine. So next I only chose the User-defined backups, and selected as my Source the stylish.sqlite file from my open Pale Moon profile. That seemed to run fine, and I got a Results Report.
Now that I had two successful backups, on FEBE Options->'What to backup', ->'User-defined backups' tab, when I clicked on Edit, I saw entries on the 'Select…' dropdown.
FEBE Options->Where to backup->Lists/Reports->View backup history now gives me a list of all backups I ran in the last couple of days. But I do notice that some, in the Report? column, have 'Yes' in red and underlined. Clicking on one that is underlined brings up a copy of that Report. But the others have 'Yes' in black, and the report is not accessible from this screen. Why is that?
Along the way I also ran 'Clear FEBE preferences', 'Verify extension directory' and 'Check AddonManager functionality'. These last two passed all the tests.
You questioned my Source field entry (image #3 of previous post). It is correct. I have learned the hard way that I never overwrite my 'master' Pale Moon profile (in my case that is su46gg4v.default) when I want to test new add-ons, new versions of Pale Moon, etc. What I do before testing any of these is make a copy of my master profile, and give the copy a descriptive name. Then I run 'palemoon –p' and create a new profile with the descriptive name. Look at screenshot #1,
"paleMoon -pUserProfilesE.png" attached. On the 2nd screen I have highlighted the name Laptop, and you will see that I have given it the name XXXDefault.XXXfromLaptop. Now when I click on the Pale Moon icon on my desktop, the 2nd screen pops up. I select the profile I want to run, and then click on the 'Start Pale Moon' button. I really like this feature.
But I am confused as to why FEBE creates two *stylish.sqlite files. They are exactly the same file; only the file name FEBE gives them are different. One file name is based on the Label and Description I provided on the User-defined backups tab, but I am not sure what the 2nd is based on. See screenshot #2, "FEBE_ResultsReport1.png", attached. Which one do I select to back up, or does it matter? Also note the Browser Console results. I cleared it just before I ran this backup. I have no idea if any of that is important or not.
It also appears that FEBE will only backup stylish.sqlite files that are in the Profile that is open in Pale Moon at the time. I tried several times to backup a stylish.sqlite file in a profile that was NOT OPEN. Sometimes I got the message that is screenshot #3, "FEBE_ResultsReport2.png", attached, and other times there was no warning message. What got backed up was the stylish.sqlite file in the OPEN Profile. [Of course the contents of all of my stylish.sqlite files are identical.]
I was able to successfully restore stylish.sqlite (I deleted stylish.sqlite in the open profile 1st, to make sure that the file from FEBE was installed). It was nice to get a warning before FEBE took the action.
So except for the few clarification questions above, it appears that I now am able to successfully backup and restore User-defined backups.
Thanks so much for all this help.