Loosing pinned tabs
When you have a number of pinned tabs that you want to stay and during a session a blank window opens behind your current active session (or you open one for some reason and forget it is open), when you close your main session (with all the pinned tabs) and find the single open blank tab session - if you close that window the next time you open Firefox it does not open all your saved tabs and you don't have the option to "restore previous session" with all the tabs because it remembers the blank window session.
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Did you check if you have windows you can restore (History -> Recently Closed Tabs/Windows) after you have restored the previous session ?
Use one of these to close Firefox if you are currently doing that by clicking the close X on the Firefox Title bar, especially if you have multiple windows open to prevent losing tabs in unnoticed windows.
- "3-bar" menu button -> Exit (Power button)
- Windows: File -> Exit
- Mac: Firefox -> Quit Firefox
- Linux: File -> Quit
You can backup the browser.newtabpage.pinned pref to be able to restore pinned tabs.
- browser.newtabpage.pinned => websites pinned to a tile
- browser.newtabpage.blocked => websites removed by clicking Dismiss in a tile
You can open the about:config page via the location/address bar. If you get the warning page, you can click the "Accept the Risk and Continue" button.
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