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Switch to vector icon #2739
<xul:image xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" anonid="icon" class="icon" src="https://addons.cdn.mozilla.net/user-media/addon_icons/0/748-64.png?modified=1510954212"/>
The biggest icon provided by GM is not big enough. It should be at least 96x96 (192x192 or larger for high dpi displays).
Firefox can auto-sacle a big image (like 400x400) for GM, so a bigger icon always helps.
UPDATE: opened an issue for Firefox https://bugzilla.mozilla.org/show_bug.cgi?id=1422026
Differences remain, but they're tiny, and the SVG form looks good at all sizes. Let's move forward!