hbogo.bg - Firefox 100 is an unsupported browser

[AmeliorateEverything]

URL: https://hbogo.bg
Browser/Version: Firefox 91.0 with a user agent version number of 100.0
Operating System: Windows 10

What seems to be the trouble?

• Video doesn't play

Steps to Reproduce

1. change firefox user agent version to 100
2. login to the hbo.bg website
3. try to play any video
4. clicking on play does nothing

Expected Behavior:
Using Firefox with user agent version number of 100 should be able to play videos on the hbo.bg website.

Actual Behavior:
hbogo.bg website appears to work fine. Trying to play any video while using the user agent "Mozilla/5.0 (Windows NT 10.0; rv:100.0) Gecko/20100101 Firefox/100.0" via general.useragent.override does nothing.

Reverting to version 91 or even using 99, works just fine.

Screenshot:

clicking on the play button does nothing.

Here is the list of JS scripts I found:
https://hbogo.bg/assets/vendor/react/react.production.min.js
https://hbogo.bg/assets/vendor/react/react-dom.production.min.js
https://hbogo.bg/assets/vendor/react/go-components.js
https://hbogo.bg/assets/5.25.5/sdk/vendor-core.js
https://hbogo.bg/assets/5.25.5/sdk/go.sdk.js
https://hbogo.bg/assets/5.25.5/sdk/sdk-core.js
https://hbogo.bg/assets/5.25.5/js/bundle.min.js

[softvision-raul-bucata]

@AmeliorateEverything We appreciate your report. I was able to reproduce the issue on the .com domain of the page as well. On the .bg domain of the page, a special account is needed to be made especially for the location of Bulgaria. Setting the UA for Firefox 100, the page returns an error message when attempting to access my account, or when that works and I can see recommendations from my page, accessing any video returns the same error message:

Tested with:

Browser / Version: Firefox Nightly 93.0a1 (2021-08-16) (64-bit) -UA set to Firefox 100
Operating System: Windows 10 PRO x64

Notes:

1. Reproducible regardless of the status of ETP

Moving this to NeedsDiagnosis for further investigations.

[miketaylr]

I do wonder if media playback that requires DRM might have expected failures for future versions. That said, I know nothing about this space.

[softvision-raul-bucata]

@miketaylr I have just seen that I have commented using your tag, instead of the reporter's tag. We have experienced this with Netflix, so it might be related to DRM failing for future versions. It would be a good idea from our side in triage and investigation to look into major websites that are using the DRM feature. Thanks.

[AmeliorateEverything]

I tested https://open.spotify.com/ since it is DRM as well and it is working. The issue seems to be present in most video-streaming DRM content.

[cpeterso]

Is hbomax.com video also broken if you spoof Chrome UA version 100 (in Firefox or Chrome)?

Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.0.0 Safari/537.36

[karlcow]

@AmeliorateEverything If you have a chance to test what @cpeterso suggests, that would be great.

[AmeliorateEverything]

@karlcow I don`t have access to hbomax, but I did the test on hbogo.bg and it seems with chrome100 it is working just fine. The issue is only with the firefox UA.

[karlcow]

Thanks. I'm asking for help around to try to diagnose the issue.

[karlcow]

@AmeliorateEverything does it still reproduce?