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<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:preferences#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.

Hmm, the forum software detected your Firefox as version 25. Is that correct?

Version 25 is not secure; Mozilla discloses security flaws after each new release. Is something holding you back from upgrading to Firefox 42? Please let us know so we can suggest solutions or workarounds.

To get the current Firefox of your preference:

• Firefox standard release - 42.0 (scroll down to your preferred language): https://www.mozilla.org/firefox/all/

• Firefox ESR - 38.4.0esr (scroll down to your preferred language): https://www.mozilla.org/firefox/organizations/all/