multi-account-containers
                                
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                        Limit to Designated Websites button doesn't work on Linux
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Multi-Account Containers Version: 7.3.0 
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Operating System + Version: Fedora 34 
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Firefox Version: 88.0.1 (64-bit) 
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Other installed Add-ons + Version + Enabled/Disabled-Status: dGuard AdBlocker extension 3.6.6 true [email protected] Amazon.co.uk extension 1.4 true [email protected] Amazon.com extension 1.3 true [email protected] Bing extension 1.3 true [email protected] Chambers (UK) extension 1.0 true [email protected] Dark Reader extension 4.9.33 true [email protected] DuckDuckGo extension 1.1 true [email protected] eBay extension 1.3 true [email protected] Firefox Multi-Account Containers extension 7.3.0 true @testpilot-containers Google extension 1.1 true [email protected] MetaMask extension 9.5.5 true [email protected] Privacy Badger extension 2021.2.2 true jid1-MnnxcxisBPnSXQ@jetpack UnloadTabs extension 0.8.5 true @unload-tabs Wikipedia (en) extension 1.1 true [email protected] Honey extension 12.4.5 false jid1-93CWPmRbVPjRQA@jetpack (not sure why removed search engines are there but oh well) 
Actual behavior
The checkbox works until i go out of the "Manage this container" section using the < button in the top left corner, when going back into the "Manage this container" section the checkbox goes back to whatever it was before clicking it.
Expected behavior
The checkbox being able to remember it's set state
Steps to reproduce
- Clicking the multi-account containers addon icon to configure it
- Clicking the > on a container
- Clicking "Manage this container"
- Clicking "Limit to Designated Sites" checkbox
- Going back using the arrow in the top left
- Clicking "Manage this container" again (checkbox wouldn't be to what you've set it to be)
Notes
I'm using the Cinnamon desktop environment but i'm not sure if that's why the issue is happening or not.
I can't reproduce on the latest version 8.0.7. Do you still experiment on it on the latest?