Add an option for automatic tab group for tabs using the same context

[Gl0b]

When having multiple tabs using the same context e.g. Banking Firefox could automatically create a tab group with the context name and color after the user would enable such feature. It's a good way to integrate container tabs into the new tab groups feature.

[Jon]

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[scindi]

Automatically group tabs

Tabs come and go which makes it hard to keep making groups. It would be nice to have a single button or shortcut that will group similar tabs. Either by address or some other identifier.

[Jon]

(Note: similar ideas have been merged into this thread)