should be the default/preinstalled with firefox

Exactly what I needed while debugging a web transparent image generator, thanks!

All the time I wasted thinking I was doing something wrong when exporting my images. And all I needed was this. Perfect solution!

How can I get this extension to work?? I never see an option to use it when I click (or right click) an image..

You don't need an extension for this! Always check if you can do simple changes with a CSS script, and you can for new tab image transparency: https://github.com/MrOtherGuy/firefox-csshacks/blob/master/content/standalone_image_page_mods.css

In your search bar, type in "about:support", find and open "Profile directory", create a "chrome" folder, create userContent.css there and add this to it:

@-moz-document regexp("(.*\.(apng|png|jpg|jpeg|gif|webp|avif|ico|bmp|APNG|PNG|JPG|JPEG|GIF|WEBP|AVIF|ICO|BMP)([\?#].*)*$)|(^data:image/.*)"){

@media not print {
img.transparent:only-child{
background: none !important;
}
}
}

Been using this ever since Firefox stopped showing transparency in PNGs.

Works perfectly. Crucial if you plan on doing literally any work with images.

Long, long ago Firefox was able to show transparency correctly as any other browser today. And then they decided to fk it up. Thanks for this addon, it gives Firefox back what it once had. Been using it for years.

A godsend! It does exactly what you need it to do and nothing more! I wish this was in Firefox as a default!