Simple Tab Groups work pretty well, especially with Sidebery. Both are recommended by Mozilla, so they are checked to not be malicious. Recommended extensions

Simple Tab Groups work pretty well, especially with Sidebery. Both are recommended by Mozilla, so they are checked to not be malicious. Recommended extensions are another bonus over Chrome as you cannot tell in general if a chrome extension is safe. https://addons.mozilla.org/en-US/firefox/addon/simple-tab-groups/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search https://addons.mozilla.org/en-US/firefox/addon/simple-tab-gr... https://addons.mozilla.org/en-US/firefox/addon/sidebery/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search https://addons.mozilla.org/en-US/firefox/addon/sidebery/?utm...