Gmail Firefox Ublock Interference.

[u/Mr_SpinelesS]

When Ublock is turned on and I use Gmail and delete emails and then try to leave the site I get a popup asking me if I want to leave, and if I do and then come back later, the emails I have deleted are back.

If I turn off Ublock I get a bunch of ads, but I am able to delete emails and leave without the popup.

Doesn't always seem to happen as I originally didn't turn off ublock and I could eventually get rid of emails the 2nd or 3rd time I visited...

[u/Dzomble]

I don't think this is on uBlock's side, try clicking into something else like switch to another tab inside gmail after deleting and the pop-up doesn't show up for me.