I just tried editing dom.ipc processCount in about:config. You can only toggle from True to False (In Firefox 83.0). I tried that. Then clicked on a link in Thunderbird and it opened Firefox to a BLANK WHITE PAGE. Toggled the setting back to True.
I just tried editing dom.ipc processCount in about:config. You can only toggle from True to False (In Firefox 83.0). I tried that. Then clicked on a link in Thunderbird and it opened Firefox to a BLANK WHITE PAGE. Toggled the setting back to True.