Just a minute ago, I was browsing the internet and typing as usual, and I got a little popup, as shown in the image.
A few days ago, on regular Firefox at work, I'd accidentally lost my tabs through misclicking to close out the whole browser window. So given I have recently had the annoyance of losing my tabs, I'm quite grateful I was saved from making a similar mistake today!
Ctrl+shit+t will get back whole windows in Firefox if you need it
Ctrl+shift+T will get you your last closed tab, or all of your tabs if you closed multiple at once. Ctrl+shift+N will reopen the last closed window, including all the tabs it contained.
Thanks for the advice!
Not if you closed it with Ctrl+q