Make the feedback link in the Adblock Browser preferences point to about:feedback again

[fhd]

Background

Back in the day, after we had disabled about:feedback, we changed the feedback link under preferences to point to our Google+ beta community (#2354). Later, we replaced this with a redirect (#2479). However, since we reactivated about:feedback, we can revert those changes again.

What to change

Change the target of the settings item Give feedback under Settings -> Adblock Browser back to about:feedback. The code in question should be identical to the upstream (i.e. Mozilla) version again.

[jwangenheim]

Since Firefox 47 about:feedback was replaced with page hosted on input.moziall.org (see: ​https://bugzilla.mozilla.org/show_bug.cgi?id=1239513). The url also contains MOZ_UPDATE_CHANNEL and MOZ_APP_VERSION.

@fhd
I guess due to this change, the last sentence in the ticket is not valid anymore and we will just link to about:feedback again?

[fhd]

How I understand that bug you linked to, about:feedback itself is not local anymore but pointing to a page hosted on input.mozilla.org. That means that we have to leave this link alone.

It also means that we have to either:

a) Replace about:feedback with a local page.
b) Remove about:feedback, and the mechanism that automatically opens it after a few launches of the app.

But we should create a separate issue for that.