Manually Install OpenH264 codec for FirefoxManually Install OpenH264 codec for FirefoxManually Install OpenH264 codec for FirefoxManually Install OpenH264 codec for Firefox

This post shows how to install the OpenH264 Video Codec in Firefox. It’s useful when Firefox fails to install it automatically, or for fine-tuning the version you want.

The solution below, found by referencing a previous profile, is as follows:

1. Download a relevant release from Cisco’s openh264 RELEASES page.
2. Open with an archiver and extract the .dll to %appdata%/mozilla/firefox/profiles/xxxxx.default/gmp-gmpopenh264/1.2 (change 1.2 to your desired version).
3. Rename the extracted file to gmpopenh264.dll.
4. Create a new file in that directory called gmpopenh264.info. Edit it and add:

Name: gmpopenh264
Description: GMP Plugin for OpenH264.
Version: 1.2
APIs: encode-video[h264], decode-video[h264]

5. Open prefs.js in the Firefox user folder and add:

user_pref("media.gmp-gmpopenh264.version", "1.2");

After following these steps you will have the OpenH264 codec enabled.