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async function doGC() {
// Run GC and CC a few times to make sure that as much as possible is freed.
const numCycles = 3;
for (let i = 0; i < numCycles; i++) {
Cu.forceGC();
Cu.forceCC();
await new Promise(resolve => Cu.schedulePreciseShrinkingGC(resolve));
}
const MemoryReporter = Cc[
"@mozilla.org/memory-reporter-manager;1"
].getService(Ci.nsIMemoryReporterManager);
await new Promise(resolve => MemoryReporter.minimizeMemoryUsage(resolve));
}