One of Mint’s idiosyncrasies is trying to close Firefox when there are multiple tabs open. The program pops up a dialogue box which asks: “Do you want Firefox to save your tabs for the next time it starts?” This is irrespective of Edit – Preferences – Tabs having the box “Warn me when closing multiple tabs” unchecked. Even worse, selecting Quit with “Do not ask next time” checked has no effect. Firefox continues to pose the same question each time it is shut down.
Finding a solution stretched my Google search capabilities but, eventually, I found a posting on the Linuxmint forum that (perhaps) provided the veritable sledgehammer to crack this particular nut.
Thus, one way to avoid the constant question is to type about:config in the address bar, promise to be careful (!), and scroll down to the “browser.warnOnQuit” entry. Right-click on this line and select – Toggle – so changing the state of the flag from true to false.
Now, when you have multiple tabs open in Firefox, and hit the close button, the program will immediately shut down – with no warning – as requested.
Firefox always warn me if closing multiple tab