[What is the] Canary build [of Chrome]
“[What is the] Canary build.
This build is for people who want to help test Google Chrome and contribute to its development. The Canary build is updated even more frequently than the Dev channel and is not tested before being released. Because the Canary build may at times be unusable, it cannot be set as your default browser and may be installed in addition to any of the above channels of Google Chrome. By default, it also reports crashes and usage statistics to Google (you can disable this on the download page).”