When visiting a website (travel) I get unvoluntarily a new tab with related subject (hotels). Why is it and how can I avoid that?

I checked the register with CCleaner.
I ran Malwarebytes and Spybot.

Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.
If the new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
You can also try to reset Firefox:
*https://support.mozilla.org/kb/Basic+Troubleshooting
If using various malware scanners does not fix it or if you are blocked from installing those scanners then ask advice at a forum that specializes in malware removal.
*http://forums.majorgeeks.com/index.php - MajorGeeks Support Forums
*http://www.security-forums.com/index.php - WindowSecurity.com Security Forums
*http://www.bleepingcomputer.com/forums - Bleeping Computer Forums

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