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hold down the Shift key and left-click the Reload button.You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files. You can try these steps in case of issues with web pages: Advanced panel - Accessibility, browsing, network, updates, and other advanced settings in Firefox.Back up and restore information in Firefox profiles.That said, it never hurts to make a backup of your profile folder just in case. I think the file format changes are minor to none, so running the old installer should work seamlessly with your existing settings. You can set Firefox's update settings to ask you before updating, and then use the link in the Knowledgebase article to find the older version installer. If that doesn't help, you might consider rolling back to Firefox 53.0.3. Sometimes updated are queued to run at shutdown or startup, and until they complete, there may be inconsistent program or OS files. If you haven't shut down Windows and restarted it since this happened, please try that. If you are not getting the Mozilla crash reporter dialog (which captures data from Firefox's perspective), hopefully someone else can help with the event logs. Unfortunately, I'm not good at reading Windows error logs.
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