Форум поддержки Firefox

I've mentioned this before but never have found good answers or feedback. Too often (well more than I'd like) I've closed Firefox and when I come back (start up Firefox again) my previous Tabs are lost. And, there is no option to restore previous session, nor closed tabs. Firefox keeps history, why can't it keep a history of previous tabs. And, why does it frequently not provide: Restore previous session. It seems that keeping a history previous tabs for a period of time isn't that difficult. Please enlighten me. This has happened to me (losing the previous tabs) more than care to remember.

With multiple tabs open, the "X" close button disappears; in Safari, the "X" appears on hovering, not in FF, so I have to open the tab to close it. It's an annoyance

Regarding the sponsored ads in the new tab screen, the help link states, "Mozilla is paid when users click on sponsored shortcuts."

I just wanted to know if Mozilla is paid for each click or for each unique click. If I click it 100 times on the same computer, does Mozilla get more income than if I were to only click it once?