I love this add-on and have always used it on Chrome. Since switching to the Firefox Browser I was glad to see that OneTab is just as useful here. I save a lot of memory on my iMac when I click this extension, but that's only because I am a tab opening queen and sometimes have 15-20 tabs open at one time. The only reason I reduced 1 star is because on both Chrome and Firefox, I have never been able to figure out where past groups are stored. I am only able to access links that from the homepage when you click on the extension. Ex: If that 1 page only stores 10 groups, old ones continue to be lost when the new ones I am saving replace the links on that 1 page. That was harder to explain in my words than I thought it would be!