QuickTime is no longer supported in Firefox.

Firefox v52+ disables all plugins except for Flash Why do Java, Silverlight, Adobe Acrobat and other plugins no longer work? {web link}

You can consider to use an external player like VLC to play these files.

So I can't steam mov files in my website ?

• stream

Unless Mozilla decides to allow plugins . . . . . . Many have complained about this.

Even the VLC plugin is no longer supported ?

I have VLC but it's not in my firefox plugin page

You will have to download the clip and play it from your hard drive.

For VLC and the VLC plugin you will have to switch to the ESR Firefox version. On Windows you shouldn't use QuickTime because the QuickTime version for Windows is no longer supported by Apple and has a lot of unpatched security vulnerabilities. I don't know if VLC can handle all .mov file formats, so you would have to check that.

• https://support.mozilla.org/en-US/kb/quicktime-plugin-play-audio-and-video
• https://support.apple.com/en-us/HT205771

Firefox 52 and later releases only support the Shockwave Flash plugin and disable all other plugins. You can use the Firefox 52 ESR release if you need to use other plugins.

Why-do-Java-Silverlight-Adobe-Acrobat-and-other-plugins-no longer work.

• https://support.mozilla.org/en-US/kb/npapi-plugins

Firefox 52.1.1 ESR:

• https://www.mozilla.org/en-US/firefox/organizations/all/
• https://www.mozilla.org/en-US/firefox/organizations/notes/
• https://www.mozilla.org/en-US/firefox/organizations/system-requirements/