In macOs, from prebuilt section, under content-disposition: attachment, default content-type and extension, only PDF link shows "open in firefox"selected by default, the remaining files (XML, SVG, WebP and AVIF won't) Then, [webp Link](https://mime.ty.ax/dl/test.bin?ty=webp&ct=image%2Fwebp&cd=attachment) won't show "open in firefox"selected by default either. Under default content-type, no extension, all files show "open in firefox"selected by default except for [AVIF Link](https://mime.ty.ax/dl/test?ty=avif&ct=image%2Favif&cd=attachment) Attaching prompt messages to demonstrate.
Bug 1662792 Comment 2 Edit History
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In macOs, from prebuilt section, under **content-disposition: attachment, default content-type and extension**, only PDF link shows "open in firefox"selected by default, the remaining files (XML, SVG, WebP and AVIF won't) Then, [webp Link](https://mime.ty.ax/dl/test.bin?ty=webp&ct=image%2Fwebp&cd=attachment) won't show "open in firefox"selected by default either. Under **default content-type, no extension**, all files show "open in firefox"selected by default except for [AVIF Link](https://mime.ty.ax/dl/test?ty=avif&ct=image%2Favif&cd=attachment) Attaching prompt messages to demonstrate.