Firefox & Bootstrap 3 Glyphicons

I’m currently working on a site which uses Bootstrap 3, and makes significant use of glyphicons. As of Bootstrap 3, glyphicons are back to being web-font based. They look fine in Chrome (which is my main desktop browser), and in Safari on iOS, but I recently noticed they didn’t work on my Android phone.

Initially, I thought it might be an Android problem, but then I spotted that they didn’t work in desktop Firefox either. Debugging in desktop Firefox is rather easier than its mobile cousin, and loading up the web console, I saw this error:

Error: downloadable font: download failed (font-family: ...): bad URI or cross-site access not allowed.

Some Googling around got me to this Stack Overflow question, which told me I needed to add Access-Control-Allow-Origin * to the headers returned in the HTTP responses for the font files. The answer was for Apache, where I was using nginx, for which the relevant snippet is:

location ~* .(eot|ttf|woff)$ {
  add_header Access–Control–Allow–Origin *;

I just added that to the location block that was responsible for serving my font files, reloaded nginx, and the icons appear correctly.

Here’s hoping this post helps someone else figure out how to get this set up.