648838 - "about:userchrome" as an editor of userChrome.css

Status: RESOLVED WORKSFORME

(Firefox :: General, enhancement)

Description

[Adam Purkrt]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0
Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0

userChrome.css file provides a powerful way of tailoring the Firefox's UI. Still, access to it is rather complicated. I would like to propose the introduction of "about:userchrome" as an easy way to edit this file.

Reproducible: Always

Steps to Reproduce:
1. enter "about:userchrome"
Actual Results:  
invalid url

Expected Results:  
open userChrome.css editor - basically, a big <textarea> with the content of the file + save/restart firefox buttons

Comment 1

[Siddhartha Dugar [:sdrocking]]

Use this addon - http://webdesigns.ms11.net/chromeditp.html

Comment 2

[Graham Perrin]

ChromEdit Plus
======================================================================

> Use this addon - http://webdesigns.ms11.net/chromeditp.html

uBlock Origin finds this in a 'Malware Domain List':  

||ms11.net^


ChromEdit
======================================================================

<http://kb.mozillazine.org/ChromEdit> is outdated. It refers to <https://addons.mozilla.org/firefox/17>, which is no longer found. 

<https://addons.mozilla.org/search/?q=ChromEdit&sort=name&type=extension> not found at AMO. 

A long shot, I ran <http://downloads.mozdev.org/cdn/chromedit/chromedit.xpi> through the Extension Converter for SeaMonkey <http://addonconverter.fotokraina.com/> wondering whether the end result might be usable with Firefox 56.0.2. Unfortunately not. 


Aris-t2/CustomCSSforFx: Custom CSS tweaks for Firefox 57+
======================================================================

<https://github.com/Aris-t2/CustomCSSforFx#user-content-instructions--howto--readme>


about:userchrome
======================================================================

+1

Nice idea. 


Some other userChrome-oriented issues
======================================================================

bug 794533 - Use a more allowing license for userChrome-example.css and userContent-example.css

bug 1404398 - userChrome-example.css is gone

bug 1409065 - Reload userChrome.css without restarting (e.g. when opening a new window)

bug 1410511 - userContent.css and userChrome.css are not consistently applied

bug 1416044 - Add telemetry for userChrome.css usage



A future without userChrome.css?
======================================================================

<https://blog.mozilla.org/addons/2017/08/10/upcoming-changes-compatibility/#comment-224171> draws attention to <https://bugzilla.mozilla.org/show_bug.cgi?id=332529#c14> under 'Run userChrome.js at startup (resp. when loading the main window)' (RESOLVED WONTFIX): 

> … (userchrome.css should probably go away for the same reasons, but that will be a different bug)

– happily, as far as I can tell, no such bug at this time.

Comment 3

[Gregory Pappas [:gregp]]

DevTools has a style editor you can use