Issue 7017 - Firefox popup not closing on tabs update

Fixes https://gitlab.com/eyeo/adblockplus/abpui/adblockplusui/issues/214

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Currently the Issue Reporter creates a new tab but it doesn't focus it until the screenshot of the current one has been taken.

Once that happens, which is an almost instant operation, the Issue Reporter tab gets updated as {active: true}.

Unfortunately this operation doesn't make the ABP popup go away, so that a manual force/close is needed.