Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Videos on a swedish newspaper site doesn't play. Getting error message instead.

more options

On the Swedish newspaper site https://www.expressen.se they have videos in many of their articles all over the site. And for some strange reason I can't get any of their videos to play in my browser. Im using windows 10 64bit Home and version 115.0 of Firefox (64bit version). Both windows and firefox have the latest updates. The error I have looks like this: https://imgur.com/a/BK9WaOC

" THEOplayer workers could not be loaded. Please check that the worker's version matches THEOplayer's version (5.1.0)".

The link to that specific page is: https://www.expressen.se/tv/nyheter/har-staller-laman-upp-som-brollopsmarskalk

I have contacted the newspaper support and they responded they have nothing to do with the issue so it must be something with my browser settings or addons that causes the videos not to play. I have tested with all my addons disabled and I still get the same result.

However the same videos works perfect in Chrome and Edge browsers. I am clueless to what may cause this very disturbing issue because I love using Firefox as my main browser but now I'm forced to browse this newspaper in chrome instead to see the videos. Not a big issue though but still... I have never in my life heard of THEOplayer and thought it was something media companies use to show their videos on their sites etc.

On the Swedish newspaper site https://www.expressen.se they have videos in many of their articles all over the site. And for some strange reason I can't get any of their videos to play in my browser. Im using windows 10 64bit Home and version 115.0 of Firefox (64bit version). Both windows and firefox have the latest updates. The error I have looks like this: https://imgur.com/a/BK9WaOC " THEOplayer workers could not be loaded. Please check that the worker's version matches THEOplayer's version (5.1.0)". The link to that specific page is: https://www.expressen.se/tv/nyheter/har-staller-laman-upp-som-brollopsmarskalk I have contacted the newspaper support and they responded they have nothing to do with the issue so it must be something with my browser settings or addons that causes the videos not to play. I have tested with all my addons disabled and I still get the same result. However the same videos works perfect in Chrome and Edge browsers. I am clueless to what may cause this very disturbing issue because I love using Firefox as my main browser but now I'm forced to browse this newspaper in chrome instead to see the videos. Not a big issue though but still... I have never in my life heard of THEOplayer and thought it was something media companies use to show their videos on their sites etc.
Attached screenshots

Chosen solution

I reinstalled firefox today with all addons disabled and checked the site and videos played like normal. Then I started enabling addons one by one until I got to Adguard addon. With that enabled the videos didn't play and in the filters section of the addon there's some javascript that are blocked for this site. But I don't know exactly which settings in the addon that causes this. As for now, I have to disable Adguard when browsing the site for it to work properly.

Read this answer in context 👍 0

All Replies (3)

more options

clear your cache, in Firefox settings, under privacy and security, then click the "Clear Data" button that's to the right of cookies and site data.

more options

Chosen Solution

I reinstalled firefox today with all addons disabled and checked the site and videos played like normal. Then I started enabling addons one by one until I got to Adguard addon. With that enabled the videos didn't play and in the filters section of the addon there's some javascript that are blocked for this site. But I don't know exactly which settings in the addon that causes this. As for now, I have to disable Adguard when browsing the site for it to work properly.

more options

I have issues like this as well, not 1 particular site but any video.

I have dropped my cache, dropped the cookies, restarted FF, restarted the PC, dropped the profile and every time it works for one or two videos and then I am back to the same issue. This seems to be since a recent change in FF. Obviously also disabled all plugins, which made no difference whatsoever.

It truly sucks, since I really do not want to move over to a different browser, but seems Firefox bricked something along the line for me.