I am having problems with my email messages with Firefox

Question

My problem with Firefox ONLY seems to occur with messages in my email (hotmail-outlook). Quite often I open an email to see no message OR I click on a link to a video and no video appears. What does appear is a black screen with the sound of the video but no picture.
Despite asking questions about this previously, there seems to be only two ways to solve this problem. The first is to clear the cache and then refresh the page and I am able to see the word text that wasn't there beforehand (I might add that this only occurs if it is a forwarded email with text; not if it is just a standard email text someone has sent to me.
The second method that seems to work is to close off Firefox by clicking the close box (X) at the top right and then reload Firefox and my email account and then all seems to work.
Is there a solution as to the cause of this problem and how I can fix it, please?
Would be most appreciative of your advice. Regards and thanks,
Anthony

Answer 1

You can check for problems with current Flash plugin versions and try these:
*disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer if installed
*disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)
*disable hardware acceleration in the Flash plugin
*http://kb.mozillazine.org/Flash#Troubleshooting
Clear the cache and the cookies from websites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes