Firefox Nightly apparently has decided to not allow extensions/addons to run for file:/// URLs and I am sorry, this completely breaks my environment (my startup page is a file:/// URL) and I find it infuriating. Maybe I can find some hidden toggle for this somewhere.
@cks Wasn't Firefox always blocking extensions launched from FS? It has always been a PITA if one writes extensions and wants to dog food before releasing.
@piero AFAIK Firefox allows signed extension .xpis to be loaded from the filesystem, but for unsigned ones you need Nightly and a special setting (I think). But my issue is for already-installed extensions with HTML pages that are file:/// URLs (instead of https: or http: or etc).
@cks OK, at first I thought you were referering to unpacked extensions loaded from disk.