NOW you tell me, after all this, that you are using a version that isn’t fixed?! I’m not happy you wasted so much of my time when your solution was so simple:
You can install the Extended Support Release of Firefox 60 – Firefox 60 with 9 more months of security patches – from the following page:
You’ll need to click the Firefox 60 link at the upper right of the list before downloading.
More info on ESR: Switch to Firefox Extended Support Release (ESR) for personal use | Firefox Help