MaxLengthWarner is a Chrome extension which warns the user if they are entering input past the maximum length of an input tag.
When using long passwords on sites which set the maximum length of input tags, there is no way to tell whether you're entering password characters past the maximum length of the field. This extension adds a shake effect to these fields, in order to warn the user of the fact that their input is not being registered.
The extension will be injected into any site, and should work on any input field where the maxLength JS DOM property is set. This also includes input tags where maxlength is set.
https://chrome.google.com/webstore/detail/maxlengthwarner/mpponigpclkmpdamdedffdlhcgdjcijn (the version here is v1.0.0)