Firefox will not open long established Juno email, has bad graphics for yahoo home page et al; all sites open ok in msie.

This just started and affect this limited number of sites. All else appears to be fine.

Can you attach a screenshot?
*http://en.wikipedia.org/wiki/Screenshot
*https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
Use a compressed image type like PNG or JPG to save the screenshot.
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
*Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*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
See also:
*http://kb.mozillazine.org/Website_colors_are_wrong
*http://kb.mozillazine.org/Websites_look_wrong

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    Did you check your security software (firewall)?
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    Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process.
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    A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
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    *http://kb.mozillazine.org/Browser_will_not_start_up

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    See:
    *https://support.mozilla.org/kb/Server+not+found
    *https://support.mozilla.org/kb/Firewalls

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    == User Agent ==
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    hello, this crash is caused by Websense Endpoint security software that is running on the system. please try to install all the updates for this program that are available...

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    You may need to delete the Firefox program folder before (re)installing the latest Firefox.<br />
    In case you still have problems after installing then check your security software.
    A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
    Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
    See:
    *https://support.mozilla.org/kb/Server+not+found
    *https://support.mozilla.org/kb/Firewalls
    *http://kb.mozillazine.org/Browser_will_not_start_up

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