What is your pick? Self-promotion OK if honest and disclosed.
Mine would be LibRedirect: https://addons.mozilla.org/en-US/firefox/addon/libredirect/
Automatically queries libraries for book availability and displays the info online on Amazon (and similar) pages.
EDIT: I see tab-stash is already on the list :D
[1] https://support.mozilla.org/en-US/kb/recommended-extensions-...
https://addons.mozilla.org/en-US/firefox/search/?promoted=re...
Mozilla would basically tell you what to do, takes longer to approve extensions, etc
Which is why we now have ublock origin.
What is your pick? Self-promotion OK if honest and disclosed.
Mine would be LibRedirect: https://addons.mozilla.org/en-US/firefox/addon/libredirect/