PDF won't open in Firefox
Since the last automatic Firefox update, my Zotero PDFs no longer open in Firefox. They all open now in Preview (Mac). The Firefox preferences say "Preview in Firefox." But this doesn't happen. I had the same problem about a year ago when Firefox updated. I don't remember how I fixed it, but I think I found a link that explained that this was a bug and gave some steps to fix it. Can anyone help?
That's Zotero 4.0.29.8 on FF 45.0.2 on Ubuntu, though haven't tried disabling add-ons yet.
Right-click --> View File works just fine.
@jolion -- does this still work for you with Snapshots (or any other attachments)?