I filed bug 1511209 on coming up with a way for reftests to share resources without turning off security checks, so that we can reenable filter-extref-differentOrigin-01.svg (which was just disabled in https://hg.mozilla.org/integration/mozilla-inbound/rev/bb3a3cc424cd#l2.17 as noted in comment 2). And in this bug here, I'll plan on just writing an HTTP mochitest that does a general verification that cross-origin SVG filters don't load.
Bug 695385 Comment 5 Edit History
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I filed bug 1511209 on fixing our reftests to stop relying on this security pref being off, so that we can reenable filter-extref-differentOrigin-01.svg (which was just disabled in https://hg.mozilla.org/integration/mozilla-inbound/rev/bb3a3cc424cd#l2.17 as noted in comment 2). And in this bug here, I'll plan on just writing a standard (not-using-a-file-URI) mochitest, which will do a general verification that cross-origin SVG filters don't load.