We run a fairly popular chrome extension with 200K+ installs and 70-90K active users (according to chrome webstore reports)
We have noticed that our numbers have started dipping in the past two months, despite a steady stream of hundreds of new daily installs. These numbers are different but broadly correlate with our Google Analytics numbers.
We suspect that some fraction of our installs are not being working, either because of some browser version-specific bugs or because it is being blocked by an anti-virus.
How do we know for sure? There doesn't seem to be some easy error reporting that we can rely on and the only other option seems to involve trying different versions and anti-viruses to see if this is true. Is there a better method?
Provide an after-uninstall form (using chrome.runtime.setUninstallURL - since Chrome 41) where a user can select the reason for uninstalling. Some extensions (ZenMate, for example) do it.