I found what was causing the issue with this extension only working intermittently. It was another extension called "Don't Accept image/webp", which is designed to stop sites serving up WebP images. With both extensions enabled at the same time, sometimes the Reddit images extension would stop working, but would work again if you disabled and re-enabled it. If the WebP extension was disabled, the Reddit one worked perfectly.

I have added an exception for Reddit in the WebP extension and now there are no conflicts and both extensions function fine.

I've raised my score to 5 stars, but I'll leave the original review below: -

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If you close your browser and re-open it, the extension no longer works until you disable, then re-enable it.

The functionality is great, but if you could fix that issue, it would be perfect.

It's little things like these I love about the Firefox mod community. Thanks for making my life a little easier.

Just one thing to ask: is it possible to expand the addon to preview.redd.it? I still get their crappy image viewer on that subdomain unfortunately.

/edit: thank you very much <3

very cool, reddit update very lame.

thanks for old picture interface

whoever made i.redd.it to redirect to a html page should be put in the hall of shame. Thanks a lot for the plugin!

Great, I f*cking hate how every single platform adds worse and worse "features" like reddit did in this case with their totally unneccessary und stupid image viewer. Extension does what it promises.

Finally!!! It supposed to be that way you view images.

Was about to quit Reddit, glad I found this extension. Great work!

Stupid fucking reddit feature. Thank you for fixing it!