Hello and good Sunday to all, I did some tests, and it seems that the culprit is "privacy badger", but without certainty for now, the extensions I use in addition to "PB": Deep Translator, Enhancer for YouTube, NordVPN, QookieFix, Qwant, Signal Spam, and uBlock Origin. Obviously, when I disable all the modules, no problem! if you have any ideas, please let me know.
Note: what is surprising is that with the same configuration, I don't encounter this problem, neither under Manjaro, nor under Neon!