In my case, it’s less about being able to open more Firefox tabs and more about Firefox being able to go longer between crashes due to a memory leak. (I know, I know… Firefox doesn’t have memory leaks anymore. It’s probably due to an extension or some bad JavaScript in one of my perpetually-open sites or something. One of these days I’ll get around to troubleshooting it…)
In my case, it’s less about being able to open more Firefox tabs and more about Firefox being able to go longer between crashes due to a memory leak. (I know, I know… Firefox doesn’t have memory leaks anymore. It’s probably due to an extension or some bad JavaScript in one of my perpetually-open sites or something. One of these days I’ll get around to troubleshooting it…)
If it’s any consolation, I also get this from Firefox when I leave tabs open for a long time.