Welcome to Firefox for Android Add-ons.
Add extra features and styles to make Firefox for Android your own.
CloseReview for Additional Folder Views by MP5678
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With the unread folders each time I click on actual unread folder it then swaps to showing the entire folder tree within this mini window.
A great shame.
I have 20 plus email addresses and maybe it this that is causing the problem.
To create your own collections, you must have a Mozilla Add-ons account.