modify firefox to show broken images

Is there a preference I can change for firefox to display broken images?  I found a code I can add to my css online (haven't checked it yet). But I would prefer to simply change firefox rather than having to remember to set this in my css.

/* Force Firefox to show image placeholders
----------------------------------------------------------*/
@-moz-document url-prefix(http), url-prefix(file) {
  img:-moz-broken {
    -moz-force-broken-image-icon: 1;
    width: 100px;
    height: 75px;
  }
}
nsitedesignsAsked:
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GaryCommented:
In the address bar enter
    about:config

and click ok to the warnings

In the search bar enter
    browser.display.show_image_placeholders

and double click the resulting found entry so it shows true
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nsitedesignsAuthor Commented:
Cool - I will give this a shot.

Is there also an easy way to view code?
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nsitedesignsAuthor Commented:
hmmm, I did what you asked and closed ff.  it still does not display broken images.
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GaryCommented:
Will double check in case this has changed.

Right click the page and click View Source
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GaryCommented:
Yep it still works, should see the broken image icon.
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Dave BaldwinFixer of ProblemsCommented:
Under 'about:config', I find this in Firefox 34:  browser.display.show_image_placeholders  But it is already set to true on this computer and on my Mac.  But apparently all that does is put up the name of the missing image.
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GaryCommented:
put up the name of the missing image
Yeah if it has alt text set, which is normal for any browser, if no alt text then it shows the broken image icon instead of nothing.
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nsitedesignsAuthor Commented:
still can't get to work.  very busy with deadlines.  will look at in the next couple days.
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Dave BaldwinFixer of ProblemsCommented:
I don't believe at this point that Firefox will display an outline of the image.  It appears it just displays the 'alt text' if the image isn't available.
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GaryCommented:
still can't get to work
It does work, have a sample page where it's not working?
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Dave BaldwinFixer of ProblemsCommented:
I think she's expecting the rectangle in the size of the image that IE8, Chrome, and Safari put up.  Firefox doesn't appear to do that.
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GaryCommented:
No, it just shows the broken image icon.
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nsitedesignsAuthor Commented:
Shazam - now it is working!  Must have been a cache issue.

Thanks fellas!
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GaryCommented:
Shouldn't haven't anything to do with cache, as soon as you change it it should be implemented immediately, even on sites already opened.
But at least it is working now.
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