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Yahoo does not display properly in firefox 31.0 but will show correctly in IE. How do I get this fixed?

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I have cleared cookies and cache, updated Firefox to 31.0 but it still keeps happening. I have even accessed my Yahoo email through the ATT site because I have an address. Nothing works. I can see my Yahoo email just fine through Internet Explorer but would prefer to do all of my internet related work via Firefox. I have no idea what to do.

All Replies (6)

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You can open the Web Console (Firefox/Tools > Web Developer). Check on the Network tab if any content is blocked and has a file size 0 (zero).

You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

  • Hold down the Shift key and left-click the Reload button
  • Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
  • Press "Command + Shift + R" (Mac)

Clear the cache and remove cookies only 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 > "Use custom settings for history" > Cookies: "Show Cookies"

Start Firefox in Safe Mode 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
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Hi avidreadr, the URL in the screen shot on the left is, which is the mobile-optimized version of the site. I don't know why you would see that in your desktop browser, unless Yahoo is unable to identify Firefox properly.

Oh, hold on, look how your Firefox identified itself to this site:

Mozilla/5.0 (masking-agent; rv:13.0) Gecko/20100101 Firefox/13.0.1

The operating system information is being blocked by the "Masking Agent" extension. Can you make an exception for Yahoo? If not, you may need to disable or remove that extension.

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So I have to figure out which add on is causing the problem and try to make an exception for yahoo. I will try that thank you.

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I have removed the plug in/application you referred to and restarted firefox but it's still showing the older version of Yahoo. I do not know what to do. I'm seriously considering chucking it all in and moving off of Firefox. Does anyone have any other suggestions?

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User Agent Mozilla/5.0 (masking-agent; rv:13.0) Gecko/20100101 Firefox/13.0.1 This is what's causing the problem. I have removed/disabled the application masking agent but Firefox is still not working right.

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Hi avidreadr, I'm not sure how Masking Agent works, but it might have changed a setting in Firefox that isn't changed back when you disable or remove it. To check that, see this article:

How to reset the default user agent on Firefox

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