CSS Filter Not Working in Firefox

CSS Filter not working in Firefox

GrayScale has limitations to work in firefox using a -moz-filter.

To get it working use the below snippet:

filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale"); /* Firefox 3.5+ */

DEMO

Why backdrop filter in Firefox don't work?

Its not supported by default https://caniuse.com/css-backdrop-filter

However you can activate it manually.

Navigate to about:config and set it to true

SVG filter not showing up in Firefox, working fine in Chrome

There's an input called coloredOut but no output called coloredOut so the filter chain fails. Removing the in="coloredOut" attribute seems to fix that. You might want to raise a Chrome bug that it's not enforcing valid filter chains.

In addition the SVG pushes the text down so you can't see it in the codepen. Adding width="0" height="0" to the <svg> element fixes that issue.

CSS blur filter not working in Firefox and IE 10, any alternatives?

CSS3 filters are not supported in IE10 or Firefox (v.23), and support is unknown for those browsers in the near future.

Have a look: http://caniuse.com/#feat=css-filters

You could use Modernizr to check for CSS filter support and fallback to a background image if not supported.

CSS filter grayscale not working in Firefox

Try setting #post:hover to this:

  filter:grayscale(0%); 
  -webkit-filter: grayscale(0%);
  filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'1 0 0 0 0, 0 1 0 0 0, 0 0 1 0 0, 0 0 0 1 0\'/></filter></svg>#grayscale");

You can look it up here. http://www.cheesetoast.co.uk/add-grayscale-images-hover-css-black-white/

in case tutorial link will be dead
works in: Safari 6.1.1, Firefox 26.0, Chrome 32.0.1700.77

.slides li img{
  filter: grayscale(100%);
  -webkit-filter: grayscale(100%); /* For Webkit browsers */
  filter: gray; /* For IE 6 - 9 */
  -webkit-transition: all .6s ease; /* Fade to color for Chrome and Safari */
  filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale"); /* Firefox 10+, Firefox on Android */
}
.slides li img:hover{
  filter: grayscale(0%);
  -webkit-filter: grayscale(0%);
  filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'1 0 0 0 0, 0 1 0 0 0, 0 0 1 0 0, 0 0 0 1 0\'/></filter></svg>#grayscale");
}

As noted by Adam below:
From Firefox 35 filter: grayscale(100%); should work.

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