Google this week made Gmail's new compose tool the default, and many users aren't happy about it. Salvador Rodriguez After announcing a controversial decision to shut down its Reader Web feed aggregator, Google is once again drawing heat -- this time for changing the way users write emails on Gmail. With the change, users now have to compose their email in a new window that pops up on top of the inbox. Previously, users were switched to a new page to write their email. Google has been experimenting with the pop-up feature since October and says it is faster and simpler than the previous way of writing emails on Gmail. QUIZ: How much do you know about Google? "We're now ready to introduce the new compose experience as the default for everyone," Google said in a announcing...