Extensions are not shown in toolbar after restore

Hello, I wanted to restore Firefox to start clean. I wanted anyway to reinstall my (few) extensions, all of which are safe and well known. When I do that, though, their icons don't show up in the toolbar. When I open the "customize toolbar" setting, extension icons aren't there. So there's no way to add them to toolbar. I tried all possible methods: - "Restore Firefox" and resync my account (extensions are reinstalled but icons not shown in toolbar / customize toolbar) - "Restore Firefox", not syncing, and manually installing extensions (icons still not shown in toolbar / customize toolbar) - Uninstall Firefox, delete everything in Profiles folder, reinstall Firefox. Same behavior. So, it seems it's something not related to a broken profile, since a fresh profile, with no syncing, does not fix the issue. Any clue of what I could try? Thanks!