Every page has an <section> element containing an <i> element with class "fa-spin". It causes the element rotating never stop with an animation. All <i> elements are rotating even it's <section> is hidden. In another words, a docuent with 256 pages has 256 animations running at the same time. It causes the content process always busy.
If the 'hidden' means visibility:hidden, then it's bug 1237454, if it means the element height or width is 0px, it's bug 1315465.
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1315465
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