I have the same problem. I restarted my computer and then FF, but the problem persisted. Then to get a clean record, I restarted FF w/ error logging turned on. Here's what happened:
1) Right-click on Trash and selecting Empty Trash brings up the warning. 2) Clicking OK makes the computer do something. 3) But the items still display in Zotero's center pane. 4) Clicking on the center pane brings up the message, "An error has occurred. Please restart Firefox. You can report this error by selecting "Report Errors..." from the Actions (gear) menu.
I reported the error (2073727293) and submitted the debug output log (D2078835564).
1) Right-click on Trash and selecting Empty Trash brings up the warning.
2) Clicking OK makes the computer do something.
3) But the items still display in Zotero's center pane.
4) Clicking on the center pane brings up the message, "An error has occurred. Please restart Firefox. You can report this error by selecting "Report Errors..." from the Actions (gear) menu.
I reported the error (2073727293) and submitted the debug output log (D2078835564).
How should I fix this problem?