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Slow Firefox and constantly getting the same error message

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I have been a user of Firefox since 2003. I have noticed that no matter what I do Firefox will lock up. I keep getting the "An error occurred during a connection to www.youtube.com. PR_END_OF_FILE_ERROR" message. I have looked on your support pages to no avail. Firefox has become incredibly slow. So slow that I cannot use it whenever I am able to get access. I am running Windows 10 and have the most up to date Firefox version. Also it is impossible to send an email to Mozilla - there is just no option to do so. I always thought you were not like Microsoft but you are steadily getting that way. I have no issues with Edge and unfortunately I am being forced to use Edge as Firefox is either too slow or does not work at all.

I have been a user of Firefox since 2003. I have noticed that no matter what I do Firefox will lock up. I keep getting the "An error occurred during a connection to www.youtube.com. PR_END_OF_FILE_ERROR" message. I have looked on your support pages to no avail. Firefox has become incredibly slow. So slow that I cannot use it whenever I am able to get access. I am running Windows 10 and have the most up to date Firefox version. Also it is impossible to send an email to Mozilla - there is just no option to do so. I always thought you were not like Microsoft but you are steadily getting that way. I have no issues with Edge and unfortunately I am being forced to use Edge as Firefox is either too slow or does not work at all.

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https://www.bing.com/search?q=pr_end_of_file_error

radi.stoyanov said Turns out the option DNS over HTTPS is what caused the problem.

jamesafuf123 said https://support.mozilla.org/en-US/questions/1264659#answer-1237475 my ISP was blocking sites like that

cor-el said This usually means that Firefox wasn't able to find a cipher suites to use to connect to this server and reached the end of the list. There can be two possibilities: one is that the server is outdated and doesn't support modern cipher suites, another might be that the server only supports a few cipher suites and Firefox doesn't support any of these.

You can check your browser and possibly compare this with the server setup.