This is a problem with 7.0.1 that has not been recognized as yet, it manifests itself it time to load, never connecting, slow performance, etc. I posted this as part of another thread and have a response I am testing.

These recommendations solves my challenges
https://support.mozilla.com/en-US/questions/882138

moderator fixed the hyperlink

Why does that link go to IANA rather than to this site?

Many people have found that setting the maximum number of connections in about:config to a lower number solves the problem of Firefox slowness.

network.http.max-connections - default is now 256 - try 48

Changed from 32 to 48. Looks as if this has worked a treat!

Oops! I spoke too soon. Next time I opened Firefox the problem had returned, and, on checking network.http.max-connections the figure had reverted to 32. I have changed it to 48 0n several occasions, but each time I close the browser the figure reverts to 32. Is there any way of retaining it at 48?

Do you have a user.js file in your profile with that setting? That would keep resetting the old value back again.

That is not the reason. The only user.js file on the PC is C:\Program Files\Mozilla Firefox\chrome\user.js and is empty.

Problem now solved. I had to uninstall Firefox completely with Revo Uninstaller, reinstall and start completely from scratch. Web pages are now loading quickly. On looking at about:config , network.http.max-connections is set at 256, and changing to 48 makes no appreciable difference.