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Internet speed tests on Firefox show a significant decrease in speed, in my case from 300Mb to 100Mb.

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Hi, I am reporting an error/bug/issue about cutting internet speed while running speedtest.net and speedtest.pl tests and other similar websites launched on the win 10 pro platform using Fierfox 64bit webbrowser. I have a 300Mb link, firefox downloads data at 100Mb speed. I tested the browsers: chrome, MS Edge (pre chromium and chromium versions), vivaldi. All but firefox are pulling the full 300Mb.

I also tested the ESR version and it has the same annoying effect. This effect also occurs in the browser on the android version - (HUAWEI P20). Interestingly, it does not appear on linux distributions related to debian (ESR version). I have updated all WIFI / Ethernet drivers to the latest versions. I've created new firefox accounts, deleted profiles, etc. It doesn't help. Please take the problem seriously. And don't refer me to tutorials on how to delete accounts, delete profiles, etc. due to being done anyway. Other browsers just work, and cross-platform. Thanks in advance for any replay.

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