Not sure there is much we can do about test-verify here. The request created for `img.src = IMAGE_URI;` (https://searchfox.org/mozilla-central/rev/a2c26b9b49a521f4be39559ca1ca9c345a237c70/devtools/shared/commands/resource/tests/browser_resources_network_events_parent_process.js#56) gets cached, regardless of `devtools.cache.disabled`.
Bug 1751214 Comment 4 Edit History
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Not sure there is much we can do about test-verify here. The request created for `img.src = IMAGE_URI;` (https://searchfox.org/mozilla-central/rev/a2c26b9b49a521f4be39559ca1ca9c345a237c70/devtools/shared/commands/resource/tests/browser_resources_network_events_parent_process.js#56) gets cached, regardless of `devtools.cache.disabled`. Edit: so one option is to add a UUID to the URL which should fix it.