Firefox asks (twice) to save and close tabs, on new open windows without tabs, when i close them.
About one month ago, i started to receive a message box from firefox, asking if i wanted to save and close tabs, on newly open windows (and pop-ups) without any tabs open on them. And everytime i close the windows without tabs, firefox asks it twice... I did not made any changes, so i don't know why it started doing this.
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I have started a chat with firefox support, and while it was that new window opened (from the chat), this problem didn't occurred, and i thought it was solved... :\
With two open windows, it does not happen. I was advised, to close the add-ons, one by one, to see if one of them is doing this.
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
- Don't make any changes on the Safe mode start window.
See:
- Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
- Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
- Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
- Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
The add-on causing this situation was:
HTML5 Extension for Windows Media Player Plug-in 1.0
Disabling it, will solve the problem. Thanks!