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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Go try the mozregression tool. It's basically a program meant for debugging problems on Firefox. You can use it to download and temporarily run any version of Firefox (all the way back to version 1 I think), including nightly releases. You just pick a version of Firefox, enter a web address, it then downloads that version of Firefox and starts running it. You can use it for however long you need for testing. It's not meant for normal usage as it doesn't save any user profile stuff.
Next time this happens, grab a profile: https://profiler.firefox.com and file a bug: https://bugzilla.mozilla.org/enter_bug.cgi