Firefox page loading problem.

I’ve a Firefox page loading problem. Sporadically but frequently this happens (SDMB is just an example) >SDMB [page opens but activity indicator keeps spinning]> Post New Thread [nothing happens until the activity indicator quits spinning-sometimes several minutes]

I’ve done all the usual checks that hardened old amateur users do. What should I look at next?

That’s something I get when my wi-fi is getting interference. I usually connect to the router’s configuration page and change the wi-fi to a different channel. Though, unfortunately, sometimes all of them have interference, and I just have to wait.