| Bug 259680: JavaScript setInterval lagging behind | |
| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". | |
| PASS numFires is within 1 of 4 | |
| PASS successfullyParsed is true | |
| TEST COMPLETE | |
| This test ensures that intervals on background pages whose duration is close to the timer alignment interval don't miss every other firing. |