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I always work with two topics, running two instances of Firefox for each. Each instance contains many tabs. The problem is that when I close the browser, all tabs are closed, and restoring the previous session opens the entire browsing history in both instances. Does anyone know how I can save the tabs in each Firefox instance so that when I reopen the browser, I can easily manage and split them?

I always work with two topics, running two instances of Firefox for each. Each instance contains many tabs. The problem is that when I close the browser, all tabs are closed, and restoring the previous session opens the entire browsing history in both instances. Does anyone know how I can save the tabs in each Firefox instance so that when I reopen the browser, I can easily manage and split them?