Hi niceque, there may be "bugs" in Mozilla's bug tracking system (Bugzilla) showing the progress of work on CSS filters.

The MDN page shows that some similar effects are available using SVG, but the actual SVG code isn't in the article itself, you have to view the source of the iframes. See: https://developer.mozilla.org/en-US/d.../filter.

Try using filter: blur(10px)
https://developer.mozilla.org/en-US/docs/Web/CSS/filter#blur%28%29

jscher2000, i know about SVG filters, but it's not a solution in perfect way

the-edmeister, look here, its the last final Firefox 23 on windows, look here

clipping because im working on Mac, and such situation even on mac Firefox 23

its not a bug, its an unsupport of filters in CSS3 spec as minimum.

Today i can realise all filters in any latest browser(mostly because all of them webkit), so wanted to have such a feeling in Gecko project

Some of the plumbing to support the blur filter should be in Firefox 25 according to this bug: 895182 – [CSS Filters] Implement parsing for blur, brightness, contrast, grayscale, invert, opacity, saturate, sepia. Based on a quick glance at the source code, it appears you will need to flip a preference for testing, so the average user will not see the CSS blur filter in Firefox 25.

• beta download: http://www.mozilla.org/en-US/firefox/beta/
• about:config preference: layout.css.filters.enabled = false by default

Footnote about Bugzilla: It's generally not helpful to add comments to bugs trying to urge things along -- unless you can help with the code -- but you can register on the Bugzilla site and "vote" for bugs to be fixed. See:

• Bugzilla Etiquette
• Voting

Master bug: 869828 – Implement CSS filters [meta]