Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and

• Remove Cookies Warning ! ! This will log you out of sites you're logged in to.

Type about:preferences in the address bar and press enter.

• Cookies; Select Privacy. Under History, select Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.
• Cache; Select Advanced > Network. Across from Cached Web Content, Press Clear Now.

If there is still a problem, Start Firefox in Safe Mode {web link} While you are in safe mode;

Type about:preferences in the address bar and press enter

Select Advanced > General. Look for and turn off Use Hardware Acceleration.

Poke around safe web sites. Are there any problems?

Then restart.

You were on the right track, thank you for pointing me in the right direction. Since I had already cleared both the cache and cookies, the only thing remaining was to reset Firefox to the default settings.

After following the preferences reset steps I had no problems with Pinterest or any other site.

Thanks again!

Note that you were blocking the referrer and not all web servers like this.

• network.http.sendRefererHeader: 0
• http://kb.mozillazine.org/network.http.sendRefererHeader