Firefox is the best browser for protecting your data. However, Firefox does require several setting adjustments to avoid intrusive tactics like ad tracking.
Select Options and then Privacy in the left hand navigation panel.
By default, Firefox does not enable the do-not-track feature. Turn it on by selecting “Request that sites not track you.” Also select “Use Tracking Protection in Private Windows”, which enables tracking protection that blocks ads and other online trackers when you’re in private browsing mode. However, few sites honor this request.
To enforce your do-not-track intentions, you need to use an add-on such as Ghostery, Disconnect, or the Electronic Frontier Foundation’s Privacy Badger. We have found that some sites do not to allow access to content with add-ons like these enabled.