Opening a mp4 file = videoElement is undefined (chrome://global/content/TopLevelVideoDocument.js:21)
Update: The issue comes from the latest NoScript update v11.2.14 (2021-12-30). Disabling the extension fixed the issue. I'll report it to them. The report is available here.
Hi,
Since the latest stable firefox version (95.0.2), it seems like opening a video file which can be played in the browser, like a mp4 file for instance, will result in an error:
05:05:35,632 Uncaught TypeError: videoElement is undefined
setFocusToVideoElement chrome://global/content/TopLevelVideoDocument.js:21
<anonymous> chrome://global/content/TopLevelVideoDocument.js:29
TopLevelVideoDocument.js:21:5
The video will plays normally, just to make it clear. Just that the error will appear in the console. And the error will keep reoccuring. Here are some video samples if you need, to see if the error is individual or global.
I checked the source changes on that file but wasn't able to find any change there so not sure why this error is occuring atm, must be a deeper reason. I was aware of that error because i'm using a GreaseMonkey script to automatically redirect some links opened to only have the video displayed with custom settings to avoid having to allow some JavaScript. The error occurs independently of the extension (checked with the script disabled, and the extension disabled).
Modified by Harest
Chosen solution
@FredMcD: Thanks for the info. I do have 95.0.2. I didn't have the latest Widevine and Firefox didn't want to download the latest version until i toggle DRM off/on. It didn't fix the issue though. Not sure what's the N / KN version of W10. I updated my original message though to make it clearer the video is working. It's just that there's a Javascript error, which as a consequence prevent my GreaseMonkey script to work.
I just searched for the N / KN version and no i've a standard W10 version. Windows Media Player is installed, etc.
If i'm the only one with the issue i guess i'll have to check with another profile. I'd have assumed the issue was maybe global. It's really something you can easily miss as it'll impact almost no user. Edit: Just did, from about:profiles using the button to "open it in a new browser" (on an unused "default" profile). I didn't have the error. I guess i'll have to troubleshoot further. Well it was quick enough to find the extension. Seems like disabling NoScript fix the issue. I guess i'll have to report to them instead. And the extension got updated yesterday, v11.2.14.
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This is a possibility: https://support.mozilla.org/en-US/kb/update-firefox-latest-version?cache=no Did you update Firefox to the latest version?
Version 95.0, first offered to Release channel users on December 7, 2021 Version 95.0.1, first offered to Release channel users on December 16, 2021 Version 95.0.2, first offered to Release channel users on December 19, 2021
https://support.mozilla.org/en-US/questions/1359657#answer-1463359
and updated to 95.0. . . . I finally found where the plugin "Widevine Content Decryption
Module provided by Google Inc." was not updating to the newest version of
December 1, 2021. Ver #4.10.2391.0
cor-el; Make sure you have the latest Widevine version. You can toggle DRM off/on to see if that makes Firefox (re)load DRM components.
- Settings -> General: Play DRM
- https://support.mozilla.org/en-US/kb/enable-drm
You can possibly check the XHR requests in the Browser Console if this doesn't work.
If you have Windows 10 N or KN then you may not have the Media Feature Pack installed. https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows
http://kb.mozillazine.org/Images_or_animations_do_not_load
https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows
https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues
https://support.mozilla.org/en-US/kb/html5-audio-and-video-firefox
https://support.mozilla.org/en-US/kb/troubleshoot-issues-with-plugins-fix-problems
https://support.mozilla.org/en-US/kb/warning-unresponsive-plugin
Chosen Solution
@FredMcD: Thanks for the info. I do have 95.0.2. I didn't have the latest Widevine and Firefox didn't want to download the latest version until i toggle DRM off/on. It didn't fix the issue though. Not sure what's the N / KN version of W10. I updated my original message though to make it clearer the video is working. It's just that there's a Javascript error, which as a consequence prevent my GreaseMonkey script to work.
I just searched for the N / KN version and no i've a standard W10 version. Windows Media Player is installed, etc.
If i'm the only one with the issue i guess i'll have to check with another profile. I'd have assumed the issue was maybe global. It's really something you can easily miss as it'll impact almost no user. Edit: Just did, from about:profiles using the button to "open it in a new browser" (on an unused "default" profile). I didn't have the error. I guess i'll have to troubleshoot further. Well it was quick enough to find the extension. Seems like disabling NoScript fix the issue. I guess i'll have to report to them instead. And the extension got updated yesterday, v11.2.14.
Modified by Harest
That was very good work. Well Done.