how to block adds on Mozilla Firefox

Activate one of the three or all three built-in features:


- Malware Blocking: block malwares which may be infected during the web browsing process.
- Remove Social Media Buttons: block other people from tracking your web browsing process such as excluding Remove function in Facebook.
- Disable Tracking: Disable ads on websites.
If you want to disable ads on Youtube, select Disable Tracking by switching from Off -->On.


Source: http://tips.betdownload.com/firefox-turn-off-annoying-ads-on-youtube-458n.aspx

Google Chrome Profile Version Error. Error message

Does anyone know why am I receiving these profile errors again and again from Chrome?

I had installed an update on my recent Chrome. After updating, it didn’t work.

So I installed the previous version of Google Chrome.
Now, I am continuously receiving this profile error message:


Your profile can not be used because it is from a newer version of Google Chrome.

Some features may be unavailable. Please specify a different profile directory or use a newer version of Chrome.

I haven’t installed any corrupt version. I have just installed the version which is a bit older then. Why does it say that the profile is from a newer version. Why this version doesn’t support the profile of a latest version?

I want some perfect answers and a quick solution on how to end this error message.

If anyone has any idea regarding this, please tell me. As I have been through this situation for 14 days and can't bear it anymore.