I've been using Text Blaze for a while, but just today it stopped working when I'm on the tab for Gmail (for my own business account). It works fine on my personal Gmail page. The extension icon is gray, and if I hover over it, it says "Chrome extensions are not supported on this website, so Text Blaze is disabled". Other Chrome extensions work fine, it seems to be just Text Blaze that isn't working on this tab.
... Ok, never mind. I decided to try closing the tab and reopening it, and now it works fine. I'll submit this post anyway since maybe this will help someone else having this issue.