My pinned 'app' tabs disappear when I close firefox, since I started syncing with another computer. Windows 7 and Windows 8.
Got a new Windows 8 non-RT tablet. Put regular firefox desktop on it. not metro. synced it with my laptop firefox whic runs windows 7. Since then my pinned app tabs don't stay after I close firefox and restart.
Chosen solution
In case you are using "Clear history when Firefox closes":
- do not clear the Browsing History
- Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
- https://support.mozilla.org/kb/Clear+Recent+History
Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.
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Chosen Solution
In case you are using "Clear history when Firefox closes":
- do not clear the Browsing History
- Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
- https://support.mozilla.org/kb/Clear+Recent+History
Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.