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Most, but not all, website no longer display as HTML. This has been happening since I downloaded the latest version of Firefox.

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The websites are accessible but do not display as HTML. Mirriam-Webster is one such site, but there are many others. However, this Firefox site and my google mail site, as well as some others, display fine.

I've pasted in an example of a website that will not display properly on Firefox but displays just fine on Internet Explorer.

The websites are accessible but do not display as HTML. Mirriam-Webster is one such site, but there are many others. However, this Firefox site and my google mail site, as well as some others, display fine. I've pasted in an example of a website that will not display properly on Firefox but displays just fine on Internet Explorer.

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Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

  • Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

  • Tools > Options > Privacy > Cookies: "Show Cookies"

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).