Once https://bugs.webkit.org/show_bug.cgi?id=112308 is fixed, hidden page DOM timer throttling can be controlled by a runtime setting. Which will make the compile time feature define flag unnecessary and should be removed.
Created attachment 272063 [details] Fix
Comment on attachment 272063 [details] Fix r=me as long as it builds everywhere.
Transmitting file data ..................... Committed revision 197009.