Add ability to hide contextual menu entries

[Nicryc]

Before submitting a bug report

• [X] I updated to the latest version of Multi-Account Container and tested if I can reproduce the issue
• [X] I searched for existing reports to see if it hasn't already been reported

Step to reproduce

1. Open the plug-in settings
2. See that there is no option to hide contextual menu entry or address bar icon

Actual behavior

There is currently no possibility to hide the contextual menu entry of this plug-in or to hide the address bar icon on the right.

Expected behavior

Add an option in the settings to hide the contextual menu entry or the icon in the address bar.

Additional informations

No response

Provide a copy of Troubleshooting Information page (optional)

No response

[dannycolin]

contextual menu entry

The "Open (Link) in New Container Tab" aren't created by the adddon but by Firefox itself when the container feature is enabled. So it'd have to be fixed upstream.

icon in the address bar

This is a duplicate of #2101. Put I'll keep the issue ticket open to track the context menu part of it.

[JamesPeiris]

To supplement the above, you can see the native Firefox container settings by navigating to about:preferences#containers

[winternet-studio]

The context menu should be on the container tab instead of any element within the document. This is especially annoying because we're used to Inspect being the last entry and the brain just automatically click that item - but now that is suddenly no longer Inspect.... 😖