I want to backup my pinned tabs and my bookmarks as they have been lost several times after windows updates

Use the Firefox SYNC, the best way to backup your content

You can use Firefox Sync to synchronize your bookmarks, passwords, settings, history, add-ons, and tabs with Firefox on other computers. First just set up Firefox Sync on your main computer and then add each of the other computers.

How do I set up Firefox Sync? - http://mzl.la/KpeZJw

How do I choose what types of information to sync on Firefox? - http://mzl.la/MnTqus

How do I add a device to Firefox Sync? - http://mzl.la/NYgEvq

Firefox stores the bookmarks and the browsing history in the places.sqlite database file..

There are 10 rotating daily JSON backups (bookmarks-####-##-##.json) in the bookmarkbackups folder within the Firefox profile folder, one for each day that Firefox is started.

• http://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox

Pinned (App) tabs and tab groups are stored in the sessionstore.js file.

• http://kb.mozillazine.org/Profile_folder_-_Firefox

See also:

• https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile