This addon is a plugin. You need to extract it to your /plugins folder to install it.
This extension gives all users the ability to see the number of characters remaining as they are adding a comment or starting a discussion. When the max_comment_length setting is exceeded, the Submit button is hidden. This prevents the user from accidentally submitting a comment that is too long.
Version 1.0.1 - Updated to only work with the default Text editor. Apparently the upload never worked.
Version 1.0.2 - Changes the button type from visible to submit to fix other issues.