How can I make my lecture transparencies (black on clear) png files visible in Firefox 11 without installing add ons on every machine at my university?
The reason I used transparent diagrams and Firefox as the default browser was so that students with dyslexia could alter the background colour to reduce glare. This is a standard solution for dyslexia sufferers. Now all of the machines at my university will require an additional plug-in installed to make transparencies visible from Firefox.
I have installed an add on to correct the problem for me, but the university machines are frequently wiped and restored from a master so any local customisations get lost.
All Replies (2)
I assume that you mean the new 'feature' to display a single image with an almost black background.
- Old Default Image Style: https://addons.mozilla.org/firefox/addon/old-default-image-style/
How did you previously deal with this?
Did you change the value of the browser.display.background_color pref?
It is possible to disable the stylesheet via a JavaScript bookmarklet, see:
javascript:(function(){if(ss=document.querySelector('link[href="resource://gre/res/TopLevelImageDocument.css"]'))ss.parentNode.removeChild(ss)})();
You can also do that with code in userContent.css or Stylish, but the latter would also require an extension.
See:
Thanks for the suggestions, but due to the nature of way the machines are configured and used within the university, I think if it doesn't work "out of the box" then it doesn't work.
I think my long term solution is to change my html and write custom page and image display code that respects foreground and background colour preference settings. That way it'll work on any browser. And in which case most of my students will use Chrome instead.