Comment 4 for bug 1971221

thanks for your replying. that is surely not a security issue. switching the window back and forth by clicking firefox window can solve this problem . I think that is firefox problem.
some other software also has a little bugs. such as : intellgence pinyin, file Explore, document viewer (default pdf reader in OS). they are not deadly, just need to be cafurelly, use them with regular way.

one serious bug is still in ubuntu 22.04 —— "programming is not responding" 。 clicking "Force Quit " or "wait" buttons cannot solve the problem. kill process through "system monitor" is also not okay. the last thing I can do is rebootint the OS.