When I start Firefox without an internet connection, the existing filters are not shown (only the "add filter" button is shown), this I understand. But when I then connect to the internet, even after refreshing toolbar data, the filters are still not shown. I have to disable this functionality in the settings and then re-enable it to see them.
There is a 1000/year limit on highlights, but no indicator saying how many highlights I have made so far, and how many is left before which date? Or am I missing something?
Also, are deleted highlights counted against the quota? I would guess not, but just wanted to be sure.