Stop worry about "button placement".
Ugh. It's broken again today. PLEASE stop worrying about "where can I place the button". Just put it on the titlebar of FireFox.
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CarolCarol
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Version 18.0 which is pending approval at Mozilla's end, already provides a toolbar button. You can check the changelog here - https://www.yourvideofile.org/update-success.html#sthash.8FDjkKLR.dpbs