What is this? Why has it changed?
What is .masterhost? Why has it replaced my Firefox homepage that tells me the news? How do I change it back?
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Sounds like you clicked onto malware links or file-rom what I can find of it. This would mean you need a computer shop to find out where that malware is hiding if it is a malware infection. Not much info is provided to know what that is from what I am finding.
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No you do not need to take it to a computer repair shop.
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware
https://support.mozilla.org/en-US/kb/how-to-set-the-home-page