1455021 - Extensions with content scripts break the XML formatter

Status: RESOLVED DUPLICATE of bug 1401793

(WebExtensions :: Untriaged, defect)

Description

[Andrei Petcu]

Attachment: Screenshot from 2018-04-18 18-48-52.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0
Build ID: 20180418112600

Steps to reproduce:

Visited a page with XML for example http://search.maven.org/remotecontent?filepath=com/jenmaarai/sidekick/2.5/sidekick-2.5.pom

I saw a nice pretty XML with highlighting.

Install an extension that injects content scripts like https://github.com/andreicristianpetcu/augury/releases/download/1.16/augury-1.16.0-an.fx.xpi


Actual results:

The XML viewer was completely broken. It showed the XML as plain text file.


Expected results:

The XML formatting should not have been modified.

This extension in Chrome does not break the XML formatting. I saw this with other extensions from AMO also. I will report the issue to Augury devs but I think if Chrome can make it transparent to addon devs, maybe Firefox can also.

Comment 1

[Andrei Petcu]

Attachment: Screenshot from 2018-04-18 18-48-46.png

correct XML viewer

Comment 2

[Andrei Petcu]

Another extension that breaks the formatting https://addons.mozilla.org/ro/firefox/addon/askblocker/

Comment 3

[Gingerbread Man]

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0
20180418112600

I can reproduce this with Violentmonkey 2.9.1
https://addons.mozilla.org/firefox/addon/violentmonkey/