I found this amazing Mozilla Firefox usage Heatmap and find it a great insight into the usage of Firefox and browsers in general.
Are there other resources which have similar heatmaps for use of popular applications publicly or otherwise available?
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The Etre blog published Five days / five heatmaps post, where the following websites were analyzed:
As it is stated in the study, the goal for users was very general ("to explore each website"):
Users were asked simply to explore each website. (While we were only interested in their interactions with the homepage, we didn't want to artificially influence their natural browsing behaviour by constraining them to only that page).