Ever since the Firefox upgrade to v100.0 (Win10 64-bit), Firefox locks up whenever it spawns a new, external process. This happens most frequently whenever the website to which I'm connected (doesn't matter which one) attempts to print or read in a file on the hard drive. This is especially true for email sites, where these functions are most often called from within FireFox. No error code appears and it's not immediately evident that Firefox even has an issue. It just becomes completely unresponsive. I have to call up the Task Manager and kill the Firefox tasks to exit. When I reinvoke Firefox, it restarts the tabs I had open at the time I killed it. This never happened before v100.0, and does not happen in any other browser. I have a friend with a Windows 10 machine who has exactly the same problem.

Any suggestions?