Firefox 150.0 cronically slow

Ask Fedora
1

Hi,
I am on Fedora 44 desktop KDE v6.6.4 and Kernel v6.19.14-300
and my Firefox v150.0 is chronically slow and I don’t know why.
This only happened after firefox updated from v149 to v150.
I cannot load pages quickly and everything is extremely slow.

I have tried other browsers that are not firefox based, and the websites are blazing fast.
I have Fiber Optic by verizon. I did so many things to see what is wrong.
I rebooted the system, I checked and rebooted the router.
I cleaned OS cache, I looked at the logs, I restarted firefox several times.
I checked my router and its connections including cable connections.
I even called Verizon and they sent out a tech that was nearby me and checked the line. Verizon guy said its not the ONT line.

Someone at Fedora staff people look into this.

Thanks.

2

Use speedtest.net to verify that this is not a systemwide problem.
Do you have another browser to test?

3

I have the same setup and Firefox is running fine.
Just tested it playing video from youtube.com.
Also running a test from speedtest.net that shows I have the max of my fibre connection here.

4

FYI there is no such thing. Everyone helping you is a unpaid volunteer.

5

Possible slowness solutions to try:

Test with a new Profile via Profile Manager
Disable all extensions/add-ons
Toggle DNS-over-HTTPS (DoH) settings
Toggle hardware acceleration
Clear startup Cache and DNS Cache
Switch between Wayland and X11 backends
Compare Flatpak vs. Native RPM performance
Identify resource-heavy tabs via Performance Manager
Reset Firefox via Refresh or full folder backup