This time I have a question to which maybe some of you may find trivial (hopefully!).

I'm running Firefox 30.0 in Kubuntu 14.04 (fresh install) and I'm having a weird problem, in some sites some symbols/logos/icons are showing terrible wrong

I'm suspecting something related to encoding but I'm not really sure.

I hope some of you have some ideas to fix this.

The icons look like this:
[

and should look like this:
[