That should go away pretty quickly. If not, just interact with the media once. After that, the flashing should be gone permanently for that media type (applies images and videos separately). I might have gone a little overboard with the tutorial and will try to tone it down in the near future.
Thank you for the feedback.

That is a bug I am aware of but I have not found the time to test and release the fix. Disabling "Adjust image quality" and "Set best image quality" should allow those posts to be downloaded again.

I don't mind a bad review but I would love to fix the issue you're having.
It would mean a lot to me if you could describe your issue and details like the post and some basic device info. You can open an issue on the "issues" tab either on GitHub https://github.com/Splat15/Bluesky-downloader-extension or on codeberg https://codeberg.org/Splat15/Bluesky-downloader-extension
Thank you

I missed this, apologies.
The setting "Set best image quality" ensures that the extension downloads the image from the best quality source (the getBlob method from the Bluesky API), which only provides JPGs. To prevent quality loss, the images are not converted or compressed but instead just saved as is. The settings being locked are more or less just visual as under the hood, compression and conversion are just being bypassed.
As for the GIFs, the extension is using FFmpeg.wasm to convert the received videos to GIFs if requested. What Bluesky labels as GIFs are actually multiple different video files internally and because of some internal shenanigans, converting the downloaded videos to mp4 is much faster than converting them to GIFs, so I added the option to choose.
FFmpeg.wasm is a JavaScript port of FFmpeg, an open source command line application which can convert nearly any media file into nearly any other. Almost all file conversion services and programs and even some media players like VLC and some video editors use it to handle the media.

Thank you for the feedback, this means a lot. Without going into too much detail, reliability is a priority for me and I specifically tested quote posts as they are tricky or even almost impossible to get right without workarounds.

As for the file path, on desktop devices you can include / in your file name to specify a folder in your download directory. For example, "bsky/%displayname%/%filename%" will save a file as bsky.app-3lxxo3i4qzs2c.mp4 in the Downloads/bsky/Bluesky folder.

Mobile devices sadly dont support this because of a limitation from the browser.

I was not testing thoroughly enough and have reworked my testing procedure. The issue you were experiencing should be resolved in the newest version.