kadgar.net nees to be contained

[Genda1ph]

• Is "Firefox will: Never remember history" in the Firefox Preferences/Options under "Privacy & Security > History" selected? Yes/No: No
• Are you using Firefox in a Private Window? Yes/No: No
• Can you see a grayed out but ticked Checkbox with the description "Enable Container Tabs" in the Firefox Preferences/Options under "Tabs"? Yes/No: Yes
• Amazon Container Version: 2.0.0
• Operating System + Version: Windows 10 21H2 build 19044.1706
• Firefox Version: 100.0.2
• Other installed Add-ons + Version + Enabled/Disabled-Status: Activate Reader View extension 0.1.2 true @activatereaderview Add-ons Search Detection extension 2.0.0 true addons-search-detection@mozilla.com Amazon Container extension 2.0.0 true @contain-amzn Amazon.co.uk extension 1.9 true amazon@search.mozilla.org BetterTTV extension 7.4.28 true firefox@betterttv.net Bing extension 1.3 true bing@search.mozilla.org DuckDuckGo extension 1.1 true ddg@search.mozilla.org eBay extension 1.3 true ebay@search.mozilla.org Facebook Container extension 2.3.2 true @contain-facebook Google extension 1.2 true google@search.mozilla.org KeePassXC-Browser extension 1.7.12 true keepassxc-browser@keepassxc.org Search by Image extension 5.0.0 true {2e5ff8c8-32fe-46d0-9fc8-6b8986621f3c} Swift Selection Search extension 3.47.5 true jid1-KdTtiCj6wxVAFA@jetpack Tampermonkey extension 4.17.6161 true firefox@tampermonkey.net Temporary Containers extension 1.9.2 true {c607c8df-14a7-4f28-894f-29e8722976af} TikTok Container extension 2.0.0 true @tiktok-container Translate Web Pages extension 9.4.2 true {036a55b4-5e72-4d05-a06c-cba2dfcc134a} uBlock Origin extension 1.42.4 true uBlock0@raymondhill.net Wikipedia (en) extension 1.1 true wikipedia@search.mozilla.org Proxy SwitchyOmega extension 2.5.20 false switchyomega@feliscatus.addons.mozilla.org

Actual behavior

Twitch streams are not embedded (black screen with some handles).

Expected behavior

Embedding multiple streams and chats in the page like shown on the screenshot (screenshot made in Private mode, since extension is not enabled there).

Steps to reproduce

1. Install the extension.
2. Open any two or more streams through the service (i.e. https://kadgar.net/live/rainbowwaffles/tanandra).

Notes

kadgar.net is one of the "multistream" services, it embeds Twitch multiple streams in a single page. Obviously, it needs to be added to container to work properly.