Add support for svg favicon in Firefox android

[moheb2000]

Firefox for desktop already supports svg images for favicon,  but in android versio,  svg favicons don't show in tab list. I think adding support for svg favicons is a good idea because other major mobile browsers and Firefox for desktop support this feature.    

[Jon]

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[Jack282]

I support this, especially if it comes to iOS builds. Currently, my search bar is filled with initials which more often than not represent the subdomain rather than the website. Some sites have raster favicons whoch firefox can use as a backup, but places like minecraft.wiki and crates.io use vector only.

[Kaoxt]

This needs to be added! Having all of these ugly icons for sites that have favicons is extremely annoying.