The icons are part of a downloadable font, fontawesome-webfont.woff, which is hosted on cdnjs.cloudflare.com. If Firefox doesn't download and apply the font, then you will get those weird placeholders instead. I don't know how many people will be affected.

First, could you check the following. When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server.

Alternately, you also can clear Firefox's cache completely using:

orange Firefox button (or Tools menu) > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

If you have a large hard drive, this might take a few minutes.

(2) Remove cookies for both your site and cdnjs.cloudflare.com. One way to do this is, while viewing your site,

• right-click and choose View Page Info > Security > "View Cookies"
• Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"

After removing your site cookies, edit the filter text at the top to cdnjs.cloudflare.com to remove its cookies. Then try reloading the page. Does that make any difference?

By the way the current release of Firefox is 19.0.2. You can update using:

Help > About Firefox > "Check for Updates" button

Because there are hundreds of changes in each version, it would be helpful if you could verify that this problem still exists in Firefox 19.

Hello I am having problem following this Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies" "After removing your site cookies, edit the filter text at the top to cdnjs.cloudflare.com to remove its cookies. "

please help

nothing changes sir. :(

As a test of how Firefox runs "uncustomized," could you create a new Firefox profile. In addition to bypassing current add-ons and custom settings, it should have completely fresh settings databases and a fresh cache folder.

Close Firefox and start up in the Profile Manager as described in Profile Manager - Create, remove or switch Firefox profiles. Any time you want to switch profiles, close Firefox and return to this dialog. I recommend using the default location suggested, and not deleting anything without making backups first.

Does the site work as expected in the new profile?

Hello Sir, Good day!

Thanks for your help! and Yes it works now sir. I created a new profile, but right now I am experiencing log or slow here in mozilla, the sometimes not responding. So sir Just want to ask, whats the reason why the characters are not showing on the default profile that I have? Thanks and Looking forward for your reply.

Hi paulique, the simplest next test would be to disable all plugins and extensions (except Shockwave Flash, which is pretty much indispensable) here, restart Firefox, and see whether your font works without them:

orange Firefox button (or Tools menu) > Add-ons > Plugins category
orange Firefox button (or Tools menu) > Add-ons > Extensions category

Thank You Sir. Your the Best

Hello Sir, I check again my website today then I experience again the errors, the characters is still not showing up same error. Why is this happen again? Thanks Please Help.

Was there any change in your plugins and extensions? I think that was the only thing that had an effect before.

When you said i disable it, I did not experience Firefox crushing or not responding. But suddenly last night when i try to open the site the characters again are not showing up. I try to create new profile but it still nothings changes. Please help.

Does that fontawesome font work in your other browsers, such as IE?

Yes it is. I check google chrome and IE right now and its all working.

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

• Press and hold Shift and left-click the Reload button.
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (MAC)

Do you see a line in the "Web Developer > Web Console" (Ctrl+Shift+K) to retrieve the fontawesome-webfont.woff font (Filter: woff)?

• https://developer.mozilla.org/en/Tools/Web_Console

GET http://cdnjs.cloudflare.com/ajax/libs/font-awesome/3.0.0/font/fontawesome-webfont.woff [HTTP/1.1 200 OK 52ms]

Are downloadable fonts working here?

• http://www.google.com/webfonts

Thank you sir. It works now. :)