Did you download Lavasoft web companion ? Please check in Programs and Features and if it is there please uninstall it.

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.

There can be other issues preventing this.

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

the I files removed were

C:\PROGRAM FILES\MOZILLA FIREFOX\DEFAULTS\PREF\DSENGINE.JS, No Action By User, [1549], [474786],1.0.3645

C:\PROGRAM FILES\MOZILLA FIREFOX\DSENGINE.CFG, No Action By User, [1549], [474787],1.0.3645

Seems to have worked, no idea how they got in It was a new build yesterday.

Thank you.

Bundled with some other software you installed. Welcome. Please Mark this as Solved so others can find the solution. Thank You.