Support high DPI image assets on the extension store

[hanguokai]

I'm not sure if the question (non-policy issue) about the extension store can be discussed here, but there's no doubt that developers care. For example, the image assets in the store listing page. Here I focus on supporting high-resolution images on the extension store, i.e. the size of the icon(logo), screenshots and promotional images(tiles), or support svg files.

Ref links:

• A related discussion.
• Chrome Web Store Supplying Images
• Edge Store listing details
• Firefox add-on listing details

Icon (Store logo, Manifest icons)

• Edge: 300x300
• Chrome: 128x128
• Firefox: 32x32 and 64x64, also support svg.

Screenshots

• CWS currently only accepts 1280x800 or 640x400 images for screenshots. This is a bad user experience on a hi-dpi screens.
• Edge store is the same with CWS, but it shows screenshots more clearly, and user can click to view the big picture.
• Firefox is also 1280x800. For other image sizes, we recommend using the 1.6:1 ratio.

In 2022, the extension store should support image assets for hi-dpi screen. For example, if screenshots's aspect ratio is 1.6, it should accept 640x400, 1280x800, 1920x1200, 2560x1600 screenshots.

Promotional images

Small tile: 440x280 pixels. I usually only provide this size of the promotional image.

[xeenon]

As mentioned in the last meeting, extension store issues are out-of-scope in this group.

[hanguokai]

I create a PR to add "Extension stores are out-of-scope" in Charter. So community members can know that in the future.