I'm pleased with this add-on's capabilities, but it may have a slow memory leak, even when not being actively used to reload a page.

I've been having memory issues with Firefox lately, so I started disabling add-ins one by one. Disabling this one freed up roughly 2 GiB the moment I turned it off. It had been active for about a week (and had probably seen thousands of tabs, millions of loads in that time).