Developer reply by patwonder
Rated 4 out of 5 stars
but don't work on nightly 46 x64 (work correctly on release
version)
For 64-bit Firefox, you need to patch the firefox.exe to work around a plugin restriction. Details in the "About this add-on" section: https://addons.mozilla.org/en-US/firefox/addon/fire-ie/
To create your own collections, you must have a Mozilla Add-ons account.