Please update to the most recent version of Firefox:

• Update Firefox to the latest release

The latest version is 40.0.3. To make sure its not a graphics issue can you please also try accessing the mail in safe mode? Diagnose Firefox issues using Troubleshoot Mode

Might also find more help contacting them about the site compatibility: http://help.1and1.com/?hc=website

Missing icons are usually supplied by a font that is downloaded from the server (@font-face) as you might see by little boxes that show the hex code of the characters instead. If you have a font installed that covers this Unicode range then you may see a real (CJK) character and not the little box with the CSS code.

Make sure that you allow pages to choose their own fonts.

• Tools > Options > Content : Fonts & Colors > Advanced: [X] "Allow pages to choose their own fonts, instead of my selections above"

You can check the gfx.downloadable_fonts.enabled pref on the about:config page and make sure that it is set to true (if necessary double-click the line to toggle its value).

• http://kb.mozillazine.org/about:config

Is the attached what you're looking for? It looks like some of those buttons are characters in the "tinymce.woff" font. Hopefully cor-el's suggestions will make them appear for you.

guigs said

Please update to the most recent version of Firefox:

• Update Firefox to the latest release

The latest version is 40.0.3. To make sure its not a graphics issue can you please also try accessing the mail in safe mode? Diagnose Firefox issues using Troubleshoot Mode Might also find more help contacting them about the site compatibility: http://help.1and1.com/?hc=website

Thanks for this. I checked the version of Firefox I'm using and it is 40.0.3. I tried accessing 1and1 webmail in Safemode and the problem still occurs - ie still no icons.

Hi Peter, did cor-el's suggestions in this post help: https://support.mozilla.org/questions/1080179#answer-774387