The Active Installs page can freeze the browser if there's an exception while retrieving the counter value

The JavaScript code used to display the counters doesn't check if the value returned from the server is a number (integer). It takes each character (digit) from the value and generates some HTML. If the value is a long stacktrace generated from the server then it will generate a huge HTML structure (a list item for each character in the stacktrace) which freezes the browser.

Moreover, the requests made to retrieve the counter value are synchronous which also blocks the browser.