Easier by what metric? Many people know how to make a screenshot. Would you really have a developer spend his time writing extensions for all major browsers that:
A. Need to be tested thoroughly or the entire survey is a bust
B. Might break the second Google pushes a change to production
It's a higher up-front investment, but when you have the extension (which is super easy to install), you can automatically collect a ton of data, potentially without the user even doing much work.
