Adblock Plus

https://addons.mozilla.org/en-US/firefox/downloads/latest/1865/addon-1865-latest.xpi?src=addondetail

 Adblock Plus is an extension that will help you get rid of the ads and banners on the internet that make the loading time of a webpage a lot higher.

Right-click on a banner and choose “Adblock” from the context menu – the banner won’t be downloaded again. Maybe even replace parts of the banner address with star symbols to block similar banners as well.

Or you select a filter subscription when Adblock Plus starts up the first time, then even this simple task will usually be unnecessary: the filter subscription will block most advertisements fully automatically.