Handle same-tab navigation

[basilevs]

Test steps

• Open Spotify
• Pin its tab
• Open a new tab
• Navigate to Google
• Search for Spotify
• Click on it (without opening a new tab)

Expected

• Pinned Spotify tab is focused
• A new Spotify URL from search result clicked is loaded in it
• Search result tab is left opened (but inactive), search results are left as they are, ready to be viewed again

Actual

The tab is left with Spotify and you turn up having 2 Spotify tabs.

A request from user review :
https://addons.mozilla.org/en-US/firefox/addon/reuse-tab/reviews/1344107/

[basilevs]

Loading previous page upon webNavigation.onCompleted would cause page of origin to be reloaded, losing its scroll position
Navigation can be cancelled in webRequest.onBeforeRequest

[basilevs]

A prototype is ready in branch #16_sameTab

It requires "<all_ulrs>" permission to stop navigation in tab of origin.
This permission is too significant and should not be requested unless absolutely necessary.

TODO:

• consider backtracking instead of stopping navigation.
• check if "activeTab" permission instead of "<all_ulrs>" is enough. It may allow to intercept requests even if this potion is not explicitly stated in its description. Even if interception is not allowed, it may be possible to use code injections to modify page behavior.