Why Isn't My CSS @font-face Rule Working in Firefox, But It Works in Chrome and IE?

CSS @font-face Rule Not Rendering in Firefox Despite Compatibility in Chrome and IE

When encountering the issue that @font-face rules defined in CSS are not working in Firefox but funktionieren in Chrome and IE, it's essential to consider various factors that can affect font rendering. Here are two potential solutions to explore:

Local Environment (file:///)

Firefox enforces a strict security policy when accessing local files (file:///) by default. To align its behavior with other browsers, modify the following preference in "about:config":

• security.fileuri.strict_origin_policy

Set this value to false to allow Firefox to load local font resources across different directory levels.

Published Website

If the issue persists on a published website, check if the font access problem is related to cross-domain issues, even though relative paths are used. Consider adding the following header to your .htaccess file for relevant file types (.ttf, .otf, .eot):

<FilesMatch "\.(ttf|otf|eot)$">
    <IfModule mod_headers.c>
        Header set Access-Control-Allow-Origin "*"
    </IfModule>
</FilesMatch>

While this modification is unlikely to resolve the issue, it's a quick troubleshooting step. Alternatively, consider using base64 encoding to embed the font typeface, which may work in this scenario.

For further guidance, refer to the following resource: [CSS @font-face: Local files not loading in Firefox](https://stackoverflow.com/questions/16392453/css-font-face-local-files-not-loading-in-firefox).

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