Why are Bootstrap's css icons not showing up in Firefox?

Question

css

Actually, a screen from chrome and firefox:

Answer 1

Figured out what the problem is. The image upload extension included its own bootstrap file and they conflicted.

Answer 2

fonts for firefox were not loaded to see.

Answer 3

+ check that the encoding of the file in which the output is correct is better to use utf-8

Answer 4

The font did not come to the client. Check the paths in the css file, look in the firebug "Compiled layout", download the bootstrap files if necessary