Random upper window above in firefox browser

[foxhole]

Get annoying horizontal window opening on top of firefox browser, only on Mac only on firefox.Anyone know how to avoid or close it [apart from closing browser].
View media item 62713

 

[big-all]

havent a clue really

have you tried hovering in that area and right clicking and see if any ticked boxes come up

 

[foxhole]

No boxes, seems to be triggered by sites which require a sign in. [mail etc]

 

[jj4091]

Have you tried clicking on view & see which tool bars are checked

 

[foxhole]

Bookmark, lastpass, Navigation are all on, none affect the problem.

 

[jj4091]

What about "add on bar" ?

 

[AlanE]

or debug?

 

[foxhole]

Found it to be the Last pass add-on though short of removing it, no fix.

 

[jj4091]

Can't you just un-check add on bar to stop it opening?

 

[foxhole]

Nothing to uncheck ? It's defeats object of having the add-on if I can't use it.