What media pak? Firefox doesn't install media pack. And how did you update firefox and how was Win10 update?

I had problems with the Windows 10 update from the update center so I downloaded the Windows 10 Media Creation Tool and did the update through this. This finally worked to get Windows 10 Pro N 1809. Because Windows 10 N Version doesn't come with codecs I have to Install the Windows Media Feature Pack to add these (Be able to watch H264 Videos and such) Firefox updates itself in the background. Just prompting me to restart to finish it.

The downgrades I did by simply installing the older version in the default directory (didn't turn the auto update off though, so it automatically updated to the latest again)

hi, this should be a workaround to avoid the tab crashes: enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named media.wmf.vp9.enabled. double-click it and change its value to false, then restart firefox once.

Seems to have worked. thank you!

I had the same problem... tabs would crash independently.

HOW TO FIX TABS CRASHING IN FIREFOX?

Not fixing my problem

1. 64 bit version : yes
2. drivers fix? try to update my nvidia drivers (gtx 960 gpu on dual screen), it didn't fix the problem.
3. hardware fix? checking RAM memory with memtest or windows RAM testing, no problem found.
4. hardware acceleration fix? try to disable hardware acceleration, it didn't fix the problem.
5. vp9 fix? try to change media.wmf.vp9.enabled, seems more stable, but it didn't fix the problem. in fact this solution works for some people because it reduces ram and cpu usage. some people have reported high usage in cpu/ram while having vp9 activated.

Check out the committed memory

finally solution was in using process explorer to find out that firefox was using a lot of memory (but not physical memory, but what is called "system commit" which is the committed memory).

I have 8Gb of physical RAM.

Each tab would increase commited memory usage Without firefox executed, my committed memory was 4Gb but each time I opened a new tab, it would take at least 300mb to 500mb more each. It could reach quickly more than 8Gb. Reaching 8Gb, it would start to be unstable. And around 9/10 Gb of committed memory, tabs would start to have display issues (square, black square, etc..). Videos would crash too. And sometimes I would get a black screen or screen would lost connection.

You can also see this limit in checking the Performances (Alt+Ctr+Del - Tasks / Performance).

Enabling Virtual Memory and setting it large enough

my virtual memory was not enabled in windows 10. i have enabled it and make it big enough. To do that, increase the minimum virtual memory and make a maximum 3 or 4 times bigger. When you will check the commited value (Altr Contr Del - Tasks / Performance), the commited value max would increase too.

Installing Autodiscard plugins

I have also installed the Autodiscard tabs plugins, which help me reduce firefox memory usage.

since then, my firefox is definitely more stable. no more crash. hardware acceleration is on enabled. no problem at all.

Conclusion 1. Firefox is huge in RAM usage especially in multi tabs, multitask environment.

2. Multitasking users like me should definitely upgrade to more RAM such as 16gb of physical RAM.