Firefox Slower to Launch in Windows 10

Callender said:

I'm going to take a guess and suggest switching DNS lookup:

Do you also happen to make use of a large HOSTS file?

Reason for asking: Edge will require DNS Client Service to be running but for other browsers there will be a slowdown if the service is enabled when using a large HOSTS file.

You could still post the info requested here:

Tried reverting back to the original hosts file. Had no effect.

I just scrolled back through the thread reading, have you tried this without Bitdefender protection? I am sorry if I missed it. I saw BD in one of the logs you posted.

Access Denied said:

I just scrolled back through the thread reading, have you tried this without Bitdefender protection? I am sorry if I missed it. I saw BD in one of the logs you posted.

Yes, that was the first thing I tried. I have mentioned that in the thread before.

I tried with Windows in safe mode and the launch time was noticeably faster in that.

Callender said:

Okay thanks for posting about:support info. I can't see any issues there.

I am also starting to think that security software might be a factor. Do you have Windows Defender enabled? If so try turning it off.

Turn On or Off Windows Defender in Windows 10 Windows 10 Tutorials

Did you try this? It's portable so runs without installation.

SpeedyFox

Bitdefender turns off Windows Defender when it installs.

Speedyfox didn't help.

Callender said:

You mean Windows Safe Mode or Firefox Safe Mode?

Try the Windows Defender thing if you use Defender alongside your AV.

Other than that try a clean boot:

Perform a Clean Boot in Windows 10 to Troubleshoot Software Conflicts Windows 10 Tutorials

It's a bit of a long winded hit and miss way to try to find a possible culprit.

Windows.

Clean boot didn't make any difference.
I believe the difference between a clean boot and safe mode is that clean boot loads some non essential drivers like graphics cards and stuff. And since there was a change when I booted windows in safe mode, I'm assuming that it might be an issue with one of these drivers. Correct me if I'm wrong.