This is specific to an SVG asset that displays only with browser.nova.enabled, which won't be enabled by default until 157. We would like to fix before 157. Setting S3 since it's a purely visual glitch, although the additional motion may be disruptive to some users.
Bug 2063751 Comment 19 Edit History
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~This is specific to an SVG asset that displays only with browser.nova.enabled, which won't be enabled by default until 157. We would like to fix before 157.~ Corrected by comment 23 Setting S3 since it's a purely visual glitch, although the additional motion may be disruptive to some users.