Why Yahoo is suddenly my homepage?

Hi, all of a sudden, Yahoo is my home page, please see the attachment. I think that it start today after update to the worm. 40.
But this is not the first time that this has happened and it is very annoying. I have google as search engine and I use it on: newtab homepage normally.
What can I do to recover my home page and get rid of Yahoo for good.

I looks a lot like Firefox but not with Yahoo as searchengine.

B.R.
Captor

Sometimes a problem with Firefox can be a result of malware installed on your computer, you may not be aware of.
More information (including how to remove it) can be found in the article troubleshooting Firefox problems caused by malware .

In some cases, the malware is delivered with other applications that seem harmless or even trustworthy. Especially if an application is provided as freeware, it is likely that it comes with adware hidden, browser hijackers or other types of malware. The best practice to prevent this malware to be installed on your computer in the first place is to always choose "custom installation", "I'm an expert", etc. during the installation as here.

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