Missing text/icon in custom toolbar buttons

[webismymind]

Here is the code used to initialize TinyMCE and its toobar:

tinymce.init({ 
    theme: "modern",
    plugins: [  "pagebreak", "textcolor", "table", "searchreplace", "image" ],
    toolbar1:  "undo redo | fontselect fontsizeselect formatselect | bold italic underline strikethrough forecolor backcolor | bullist numlist | alignleft aligncenter alignright alignjustify | outdent indent | pagebreak"
});

On Google Chrome (MacOS), the toolbar is OK:

On Firefox (MacOS), the "fontselect", "fontsizeselect" and "formatselect" are empty:

Note that if I don't specify any custom toolbar, then the toolbar is OK both on Firefox and Chrome.

[spocke]

Can this be reproduced on the tinymce site or in a fiddle.tinymce.com could be a css conflict?

[webismymind]

Thanks for your answer.

I tried to reproduce on fiddle.tinymce.com (which I should have done in the first place), but everything was working well.

So I tried again in our application and the problem has disappeared! All toolbar buttons are now visible and the toolbar has the same "flat" look as in Google Chrome.

I don't know if something has changed on our side (I don't think so) or if the upgrade to Firefox 42.0 fixed this issue. Anyway, sorry for bothering and thanks again.