Padma is a Firefox plugin that enables users to read various Indic websites by converting their non-standard text to Unicode text. Padma has supported Anandabazar Patrika (ABP), the largest Bengali newspaper, for more than two years now. However, ABP (also Bartaman Patrika) support in Padma has a major matra-rendering bug which is explained in details here.
Couple of months ago, I made an effort toward fixing the above issue. You can get an improved version of Padma from here. This version resolves most of the matra rendering issue (if not all) for both Anandabazar Patrika (ABP) and Bartaman Patrika.
Update (Jul 9, 2010): To solve this problem at its root, please visit Anandabazar Unicode petition site where you can read Anandabazar using any browser such as Firefox, Chrome, Opera, Safari, IE as well as mobile phones.