Permissions are not listed in descending order of priority

[vasilicatamas]

Steps to reproduce:

1. Navigate to https://addons-dev.allizom.org/en-US/firefox/addon/permissionsorder1/
2. Click on “Permissions” link.

Expected results:
Based on https://bugzilla.mozilla.org/show_bug.cgi?id=1339952#c1 the permissions are listed as follows:

• the hosts permission: because this is probably the most understandable risk. It's related directly to what people use firefox for, browsing.
• native messaging: because it means you are getting out of the Firefox sandbox.
• the rest (no order)

Actual results:
Permissions are not listed in descending order of priority.

Additional notes:

• This issue reproduces on AMO-dev using Firefox 54.0a1 (2017-03-02) under Windows 10 64-bit.
• This priority order is already applied in installation permission pop-up.
• Please see the attached screenshots for this issue:
  
  

[eviljeff]

The PRD didn't specify there was an order of priority so...

[vasilicatamas]

Seems that clipboardRead and clipboardWrite permissions are not displayed in the same order they appear in browser pop-up, The browser displays permissions in the order they are declared in manifest json, excepting hosts and native messaging. Tested using https://addons-dev.allizom.org/en-US/firefox/addon/promptable5/ on Firefox 55.0a1 (2017-03-09):

[eviljeff]

There's no particular reason to display them in the manifest order - they are displayed in alphabetical (of the permission name) instead. It would be better if Firefox did that too because that way the ordering is consistent between different add-ons.

[vasilicatamas]

Filed https://bugzilla.mozilla.org/show_bug.cgi?id=1346722 at the suggestion of eviljeff .

Verified fixed on AMO-dev using Firefox 55.0a1 (2017-03-12). Permissions are successfully listed in descending order of priority. Postfix screenshot: