HI, it has nothing to do with the update but rather some site you visited that stuck in something that changed your home page and maybe more. The URL comes out as clean but no idea what XYZ is. You have Malware. Suggest keep a eye on bank accounts.

Please use more than 1 scanner as each uses diff tech :

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware

Save your Report and google each before deleting anything as do not want to delete something you need, If need help :

• https://forums.malwarebytes.com/topic/9573-im-infected-what-do-i-do-now/

Post in only 1 forum, then wait.

Please let us know if this solved your issue or if need further assistance.

If you have an extension with a name similar to "YouTube Best Video Downloader", disable it. More info in this thread:

https://support.mozilla.org/questions/1210834

You can view, disable, and often remove unwanted or unknown extensions on the Add-ons page. Either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons
• type or paste about:addons in the address bar and press Enter/Return

In the left column of the Add-ons page, click Extensions. Then cast a critical eye over the list on the right side. Any extensions Firefox installs for built-in features are hidden from this page, so everything listed here is your choice (and your responsibility) to manage. If you have that extension, or anything suspicious or that you just do not remember installing or why, disable it (or remove).

Thank you!! JLM