Ghostery is an excellent piece of software but it caused me a few issues. For instance I logged in to my bank and couldn't view any statements. It was Ghostery blocking something so I whitelisted the site. Not a big issue but it took me some time to realise it wasn't a problem with my bank's website.

I went on to uninstall Ghostery because I was worried the unpredictable behaviour it introduces might cause some frustrating issues, particularly when going through a process like filling out a long online form only for it to fail at the end.