After we got my patch to build successfully, I wanted to check it actually solved the issue. If it did then, [browser_start_up_mainthreadio.js](https://searchfox.org/mozilla-central/source/browser/base/content/test/performance/browser_startup_mainthreadio.js) should fail without my patch because without my patch it's doing main thread IO on start-up. However, `browser_startup_mainthreadio.js` should succeed with my patch/changes because it no longer loads the minidumps directly on startup, and instead loads it lazily. `browser_startup_mainthreadio.js` wasn't working though. The test is always skipped. See Bug 1831406.
Bug 1541603 Comment 19 Edit History
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After we got my patch to build successfully, I wanted to check it actually solved the issue. If it did then, [browser_start_up_mainthreadio.js](https://searchfox.org/mozilla-central/source/browser/base/content/test/performance/browser_startup_mainthreadio.js) should fail without my patch because without my patch it's doing main thread IO on start-up. However, `browser_startup_mainthreadio.js` should succeed with my patch because it no longer creates the minidumps directly on startup, and instead loads it lazily. `browser_startup_mainthreadio.js` wasn't working though. The test is always skipped. See Bug 1831406.