Fix #1958 - Propagate container list reordering in Firefox menus

[dannycolin]

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• I rebased my work on top of the main branch.
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Description

Since Fx 123, we have a new API (contextualIdentities.move) that let us reorder the container list everywhere in Firefox. This patch looks if the API is supported by the client and propagate the change if it's the case.

Type of change

Select all that apply.

• Bug fix
• New feature
• Major change (fix or feature that would cause existing functionality to work differently than in the current version)

Tag issues related to this pull request:

• Reordering containers in Manage Containers doesn't apply to other Firefox menus #1958