This is what I find when I google that error. This was an accepted answer on another forum
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
references<Enter> in the address bar.
- 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
references#advanced<Enter> in the address bar.
Under
Advanced, Select
General. Look for and turn off
Use Hardware Acceleration.
Poke around safe web sites. Are there any problems?
Then restart.