I'm author of GroupSpeedDial add-on for Firefox (and Chrome) used by ~50k users.
I would like to report issues with your product "Malwarebytes" reported to me by several users.
What Malwarebytes does is deleting or corrupting files that contains my add-on database "IdexedDB" (standard database API for add-ons, see https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API). Then my add-on won't load correctly and users see on the main dials page just error message mentioning corrupted database.
The files are located in:
My add-on is using database to store thumbnails and backups. So it contains all URLs of pages that users have in their dials. Maybe some of theirs pages are detected and thus reason to block the access to that file? I'm just guessing here.
Anyway, please let me know once this is fixed, because there is nothing I can do.