267248 - [GC] image added via CSS content in userContent.css is not displayed

Status: RESOLVED WONTFIX

(Firefox :: General, defect)

Description

[Hanspeter Niederstrasser]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.3) Gecko/20041027 Firefox/1.0RC1
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.3) Gecko/20041027 Firefox/1.0RC1

I have the following in userContent.css

a[target~="_blank"]:after
{
  content: url(new.png);
}

When I load a local file that has <a href="" target="_blank">, the image
"new.png" is placed just after the linked text.  However, the same remote page
does not load the image and throws a security error in the JS console.

Reproducible: Always
Steps to Reproduce:
1. Place the above code into userContent.css (and get a suitably named new.png file)
2. load a local HTML file with a link having target="blank"
3. watch the little image show up after the link
4. now load a similar remote HTML file
5. watch the missing icon and notice an extra space where the image would go.




The following error shows up in the JS console.

Security Error: Content at https://bugzilla.mozilla.org/show_bug.cgi?id=151249
may not load or link to
file:///C:/Documents%20and%20Settings/nieder/Application%20Data/Mozilla/Firefox/Profiles/profilename/chrome/new.png.

The error indicates that the image was not loaded to prevent remote files from
loading local files.  While this makes 100% sense for a remote page doing
something like <img src="file://image.png">, it does not make sense that this
logic gets applied to content generated via userContent.css.

This worked fine until about 2 weeks ago, and then it stopped.  Searching
suggests the fix for Bug 69070 caused this.  This is not a dupe of that bug
because that bug deals with http: documents loading file: images, while this
report is specifically for userContent.css being able to load file: images.

Comment 1

[Kathleen :Brade]

Who are the correct people to cc on this bug?  Should it be reassigned?

Comment 2

[Boris Zbarsky [:bzbarsky]]

In 1.7, the image is actually loaded by the document the CSS is applied to.  In
other words, the remote document.  The document has no idea what CSS file the
style comes from.

On trunk, the CSS file is what loads the image, so things work fine.

Marking worksforme, since this works fine on trunk and is filed as a trunk bug.

Comment 3

[Hanspeter Niederstrasser]

checked around: this only happens with a firefox-aviary build (FF and seamonkey
trunks are OK).  Changing product and version to FF 1.0branch and reopening.

Comment 4

[timeless]

note that changing this for ff1.0 would mean changing this for mozilla1.7.x. and
of course, if this was fixed by some huge rewrite then it really shouldn't move
to any branches, especially at this late date.

Comment 5

[Boris Zbarsky [:bzbarsky]]

> if this was fixed by some huge rewrite

It was.  Hence my not just pushing the bug off onto branch.

Comment 6

[Hanspeter Niederstrasser]

(In reply to comment #5)
> > if this was fixed by some huge rewrite
> 
> It was.  Hence my not just pushing the bug off onto branch.

Well, the bug IS occuring in the aviary branch.  Since fixing it apparently
would entail large changes to the branch that shouldn't be done due to
stability, etc etc etc, it probably deserves to be WONTFIXed then.

Comment 7

[Boris Zbarsky [:bzbarsky]]

Yeah, that's probably the right resolution.