Brief Summary
Safari has a SafariForWebKitDevelopment binary used to test and develop WebKit with it. It would be good if Orion provided such a binary too.
Details:
Since Orion uses WebKit like Safari a common refrain in bug reports is to verify whether it reproduces on Safari. If it does, the bug is likely to be in WebKit. The next step is to figure out whether updating WebKit in Orion would fix the bug in Safari and in Orion. The automated builds of WebKit at https://webkit.org/build-archives/ contain a script that launch Safari with the new given WebKit version, and it uses the SafariForWebKitDevelopment binary at /Applications/Safari.app/Contents/MacOS/SafariForWebKitDevelopment. If Orion had a similar binary it would be very easy to either provide a similar script for Orion, or to manually modify the existing script, and test new versions of WebKit with Orion to diagnose bugs and verify fixes.
For example see https://orionfeedback.org/d/5283-scrolling-bounces-back-when-page-changes-size/13.