We are no longer using the custom v0.24.0 in-tree but we are using an older geckodriver version from sitespeedio: https://searchfox.org/mozilla-central/source/tools/browsertime/package-lock.json#13 I found that v0.26.0 worked for us as well so we could upgrade to that, and then we would be using the same version as sitespeedio: https://github.com/sitespeedio/browsertime/blob/master/package.json#L27
Bug 1608033 Comment 2 Edit History
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EDIT: Searchfox hasn't updated it's code yet...