Corrupted image saving / Pixel misalignment when downloading large AI-generated images

   Generate an image using Gemini Web.

   Right-click the generated image and select "Save image as...".

   The saved image file (which is around 8MB uncompressed) is frequently corrupted.

   There are noticeable pixel misalignments, visual glitches, and tearing across the image.

   Re-saving the exact same image causes the glitches to appear in different random locations, indicating an unstable data transfer from memory to disk.

   Sometimes, the saved filename gets appended with random gibberish characters (e.g., Gemini_Generated_Image_fuy00sfuy00sfuy0.jpg).

Steps to reproduce: Generate an image using Gemini Web. Right-click the generated image and select "Save image as...". Actual results: The saved image file (which is around 8MB uncompressed) is frequently corrupted. There are noticeable pixel misalignments, visual glitches, and tearing across the image. Re-saving the exact same image causes the glitches to appear in different random locations, indicating an unstable data transfer from memory to disk. Sometimes, the saved filename gets appended with random gibberish characters (e.g., Gemini_Generated_Image_fuy00sfuy00sfuy0.jpg). Expected results: The image should be saved completely without any data corruption or pixel misalignment. Additional Context: > When performing the exact same action in Google Chrome, the browser negotiates a compressed format (around 2MB) and the image saves perfectly with 100% data integrity and no visual glitches. The issue seems isolated to how Firefox handles large image blob data saving.