User Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:74.0) Gecko/20100101 Firefox/74.0

Steps to reproduce:

On a fresh install (I deleted my profile under ~/.mozilla) of Firefox 74.0 (64 bit) (the latest one that ships with Fedora 31) I can't use the Network Monitor properly.
Perhaps the behaviour has changed on this release but I cannot select a single request in the Network Monitor tab. Some requests are bundled together with others for no obvious reason (in a consistent way tho).

Actual results:

I attach a pic:
https://imgur.com/VYopIY2

Expected results:

Before this bug I could select all requests on their own, just one at a time, to inspect them. This bundling doesn't allow me to inspect some requests, whenever they get bundled together with others. I assume this is a UI bug.

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

@David, I have a test Linux build with a patch that could fix the problem. Can you please test it on your machine and let me know if you see any improvements?

https://treeherder.mozilla.org/#/jobs?repo=try&selectedTaskRun=cLVTUs1PRt-wMqG-zHYwrA-0&revision=a52f9ef58a1f40479e5900b4e085e99f3ef4ef93

You can download the build target.tar.bz2 from the Job Details tab available at the bottom of the page.

I can't reproduce the issue on my machine.

Thanks,
Honza