Blog Comment Autofill is a Greasemonkey script that pre-fills your comment details (name, email and URL) in blog comment fields. It currently supports WordPress and Movable Type, which constitute a large number of useful and comment-worthy blogs out there.
After installing the script, it asks you for your details once so that it can fill it up every time you load a blog page with a comment form. What if, you launch a new blog and need to promote it? There is no direct method to update it from options. This tutorial shows you how to use a simple and quick about:config hack, you can update the details at will.
- Type
about:configinto the address bar and hit enter. Click OK to get through the warning and reach the about:config settings page. - Type “blog” (without quotes) to the field named “Filter”. A few entries by the name “GreasemonkeyScriptvals.bca/BlogCommentAutofill” will come up(screenshot below).
- The three values that you may need to edit end with “.author”, “url” and “email”. Double-click on the value to get a popup box into which you can type the new details. Make sure to not edit any other setting.

Your settings will now have been updated. Whenever you need to update them, follow the above procedure.
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Thanks – I was going to create a script like this. You saved me some time!
You can do this much more easily without having to use about:config by right clicking on Greasemonkey icon and selecting Reset Prefill Comments from the User Scripts Commands menu
@Binny: Glad you found it useful.
@Keith: But then, you’d have to enter all three details again – with this method, you can edit precisely what you want and leave the other settings intact.
@Sumesh Quite true, I agree with you on that point.
But several lay users may find the latter method useful since it does not involve editing something they are not comfortable with.
i’ve been searching for such kinda info for long …i did check out the method you mentioned its worthy.
thnx
thanks for this script. easy to comment now
thank
Thanks; that could save some time, but chrome and other such browsers pretty much auto fill-in anyway don’t they?