I personally don't mess with profiles. I download firefox developer binaries and put them in ~/bin folder which uses a different profile by default (no extensions for web dev test).
Interesting, you might be on to something! I just tried this and it seems to help. How does this make any sense though as I cleared cache/cookies and have factory settings in my other profile?
I am also in Texas. Also using Mozilla Firefox on Fedora, on Spectrum / Road runner / Charter.
https://support.mozilla.org/en-US/kb/profile-manager-create-...
I personally don't mess with profiles. I download firefox developer binaries and put them in ~/bin folder which uses a different profile by default (no extensions for web dev test).