Sorry what is it your trying to do as Widewine Content Module is already installed in Firefox under Tools - -> Add-ons - -> Plugins In Right Top Corner by the little Gear Icon there is a Menu under that to Update it and or (Not Sure Here Myself) Install Add-ons From File. This is possibly why you are getting the file downloaded in this case.

Please let us know if this solved your issue or if need further assistance.

(sp)

it is not installed it's stuck on will be installed shortly can not view DRM secured media which requires widevine either

If the components are corrupted or damaged then it is possible that your security software in interfering.

Do the other components load properly or are those also missing in "Add-ons -> Plugins"?

Try to delete the gmp-widevinecdm folder in the profile folder if there are currently files in it.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox

Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen or hold down the Shift key) to see if that works.

• http://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/
• http://www.7tutorials.com/4-ways-boot-safe-mode-windows-10

I have only one other plugin installed which is the h264 codec which loads properly. In the profile folder is no gmp-widevinecdm folder only a gmp (with an empty folder named WINNT_x86_64-msvc inside) and the h264 codec folder gmp-gmpopenh264. Tried safe mode it did not install automatically and was also still not abel to manually isntalled via widevine website same error addons would be damaged.

edit: for security software I have only windows defender and firewall running

You can try to use the Live Http Headers extension to catch the request to download the plugin and see what happens if you paste this link in the location/address bar.

• https://addons.mozilla.org/firefox/addon/live-http-headers/

Toggling DRM off/on should make Firefox send a new request to check for GMP updates (update.xml). It can take a few seconds before this request appears. In the update.xml file you should see a link to the Widevine ZIP archive. If Firefox requests this file then you can check the response headers. Since this is a ZIP archive it may catch the attention of security software.

OK so this is what comes up in the http header window:

https://aus5.mozilla.org/update/3/GMP/54.0.1/20170628075643/WINNT_x86_64-msvc-x64/de/release/Windows_NT%2010.0.0.0%20(x64)/default/default/update.xml

GET /update/3/GMP/54.0.1/20170628075643/WINNT_x86_64-msvc-x64/de/release/Windows_NT%2010.0.0.0%20(x64)/default/default/update.xml HTTP/1.1 Host: aus5.mozilla.org User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:54.0) Gecko/20100101 Firefox/54.0 Accept: */* Accept-Language: de,en-US;q=0.7,en;q=0.3 Accept-Encoding: gzip, deflate, br Cache-Control: no-cache Pragma: no-cache Cookie: optimizelyEndUserId=oeu1496024908874r0.2480185240502768; optimizelySegments=%7B%22245617832%22%3A%22none%22%2C%22245677587%22%3A%22ff%22%2C%22245875585%22%3A%22direct%22%2C%22245984388%22%3A%22false%22%2C%22246002457%22%3A%22referral%22%2C%22246048108%22%3A%22false%22%2C%22246073289%22%3A%22none%22%2C%22246073290%22%3A%22ff%22%7D; optimizelyBuckets=%7B%7D; _ga=GA1.2.1797209984.1496024909 Connection: keep-alive

HTTP/1.1 200 OK Cache-Control: public, max-age=90 Content-Encoding: gzip Content-Security-Policy: default-src 'none'; frame-ancestors 'none' Content-Type: text/xml; charset=utf-8 Date: Mon, 03 Jul 2017 14:51:42 GMT Strict-Transport-Security: max-age=31536000; Vary: Accept-Encoding X-Content-Type-Options: nosniff X-Proxy-Cache-Status: HIT Content-Length: 439 Connection: keep-alive

I followed this link from the header: https://aus5.mozilla.org/update/3/GMP/54.0.1/20170628075643/WINNT_x86_64-msvc-x64/de/release/Windows_NT%2010.0.0.0%20(x64)/default/default/update.xml

which brings me to this link: https://redirector.gvt1.com/edgedl/widevine-cdm/903-win-x64.zip

when pasting this link in the adress bar "Error: Connection Failed" mesage comes up

Ok the "Error: Connection Failed" gave me a suspicion I have various IPs blocked in the hosts file. Used the back up original hosts file with no blocked IPs and URLs and voila it installed after unchecking and checking the DRM box.

(Weirdly enough Google Chrome is able to update its widevine plugin even with the modified hosts file)

thanks for the hint. solved.