Firefox doesn't have tab grouping like Chrome, or the Collections feature that Edge offers, but it does have some excellent third-party browser extensions you can make use of.

Edge Canary is testing multi-tab summarization, letting Copilot scan several open tabs at once and give combined answers.

For both Firefox and Microsoft Edge, you can also go through your browser history to find and reopen a tab you accidentally closed. Firefox has a dedicated sub-menu under History called Recently ...

Microsoft is launching an AI Copilot Mode in the Edge browser, allowing users to talk to the AI about their browser and allow Copilot to see across tabs.