'The only idea I have is that Firefox's encryption implementation is absolutely bad or doesn't use hardware acceleration. My friend is experienced and he told me the following after I did that with TLS and told him: I successfully got my upload speed to 8MB/s (still not what I should be getting) on Firefox by forcing an old TLS version in about:config and by setting the following to 1: (and to be honest I asked around 10 friends and only one of them has this problem, so it's not really easy to reproduce)įew people on the internet has had this problem but no helpful answers to it. One of my friends also has the same problem and he's in another country. What I think is that my country (Jordan) has a problem with Firefox ports or something, it's really weird. (this shocked me because it's the same problem) And lastly I tried on my friend's home with a different ISP.Tried on ubuntu, I got the same slow speed (even though it was 35mbps on ubuntu but still far from my max which is 350mbps or 44MB/s).

A fresh Windows install (both Windows 7 and 10).

Now before you tell me to clear cache or reset Firefox or reset or change router or anything, I saved you time by doing a lot of things including: I tried uploading on all other browsers (Edge, Chrome and even Internet Explorer) and I got 45MB/s with upload except for Firefox, I get 2.5MB/s

I should be getting my max speed which is 350mbps for upload.

Please read the explanation on 'What should have happened? (expected results)' below. The problem exists for me (and my friend) on any browser based on Gecko. I tried uploading on Google Drive or any speedtest like, max speed with upload I get is always ~18mbps)ĭownloading with Firefox is fine, but not uploading. Uploading any file in Firefox is so slow (max is 20mbps or 2.4MB/s) I tried uploading a file and noticed that Firefox is slow with uploading.

Dropbox download speed slow