Browser plugins are rapidly becoming the most common way to get a computer virus infection.
Normally I lecture people about switching to Firefox, installing NoScript and checking at least monthly that Java and Adobe are up to date. The folks at Mozilla seem to be on a quest to save me from forever repeating those instructions, and I thank them kindly.
My instructions are now a bit simpler:
Switch to Firefox
Use this website to make sure that you are safe. https://www.mozilla.com/en-US/plugincheck/
Check back with the website weekly.