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Firefox stops downloading resources after heavy use

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When I use firefox very heavily (100-200 tabs open) then after few weeks or sometimes about month of use it stops downloading some resources. Sometimes its videos that no longer play. This time it was images. This time it started with spotify logging me out automatically after I logged in. It did not lag, it was not slow it was running smoothly. It just started to log me out like in 10 sec after login. I switched to Edge and it didnt log me out there. The bug was also in private browsing. Few minutes later I discovered that Aliexpress stopped showing me new images - it would load me images that I had already visited but for new images it would just show me empty box and image alt text. This also broke in both normal mode and private browsing mode. In Edge this also worked so I understood it was firefox problem, not my network problem.

To solve the issue I tried to clear recent history for time range everything and checked cache and offline website data. It did not help. Then I also tried to use forget about this site from history and Ctrl + F5 to make it force reload data. It did not help either. I also tried garbage collection and cycle collection because I thought that something was wrong in the memory.

After these operations I tried to manually visit image location which I grabbed using inspect element. It turned out that firefox indeed downloaded the image but it turned out it did not completely download it. It downloaded 8.22kb data instead of 12kb and image viewers were not able to open it while visiting the same url with Edge gave me correct image which means that it wasnt faulty resource on server side.

When it previously happened to me videos stopped to play both in private and normal browsing. It also does not seem to be dependent on FF version. This time it happened with FF 70.0. It was not running out of disk space - had still over hundred GB left nor RAM (it only used 25G out of 64G). I use Windows 10 x64.

I know I could have solved this issue with browser restart (which I did by now) but but since I usually have a lot of stuff going on and just restoring tabs isn't enough for me because reloading tab from internet does not restore it exactly as it was before since all the JS progress will be lost but sometimes some tabs I need exactly as they were which is why I would not like to restart firefox very often.

I would like to know what causes such issues and if there is any other way than browser restart to fix it? Like manually deleting something from somewhere?

When I use firefox very heavily (100-200 tabs open) then after few weeks or sometimes about month of use it stops downloading some resources. Sometimes its videos that no longer play. This time it was images. This time it started with spotify logging me out automatically after I logged in. It did not lag, it was not slow it was running smoothly. It just started to log me out like in 10 sec after login. I switched to Edge and it didnt log me out there. The bug was also in private browsing. Few minutes later I discovered that Aliexpress stopped showing me new images - it would load me images that I had already visited but for new images it would just show me empty box and image alt text. This also broke in both normal mode and private browsing mode. In Edge this also worked so I understood it was firefox problem, not my network problem. To solve the issue I tried to clear recent history for time range everything and checked cache and offline website data. It did not help. Then I also tried to use forget about this site from history and Ctrl + F5 to make it force reload data. It did not help either. I also tried garbage collection and cycle collection because I thought that something was wrong in the memory. After these operations I tried to manually visit image location which I grabbed using inspect element. It turned out that firefox indeed downloaded the image but it turned out it did not completely download it. It downloaded 8.22kb data instead of 12kb and image viewers were not able to open it while visiting the same url with Edge gave me correct image which means that it wasnt faulty resource on server side. When it previously happened to me videos stopped to play both in private and normal browsing. It also does not seem to be dependent on FF version. This time it happened with FF 70.0. It was not running out of disk space - had still over hundred GB left nor RAM (it only used 25G out of 64G). I use Windows 10 x64. I know I could have solved this issue with browser restart (which I did by now) but but since I usually have a lot of stuff going on and just restoring tabs isn't enough for me because reloading tab from internet does not restore it exactly as it was before since all the JS progress will be lost but sometimes some tabs I need exactly as they were which is why I would not like to restart firefox very often. I would like to know what causes such issues and if there is any other way than browser restart to fix it? Like manually deleting something from somewhere?