Rated 5 out of 5 stars
I like it very much, well done. One suggestion: You could make the "Keep name" option default(able), as, for example, I always want to keep the name...This review is for a previous version of the add-on (1.3.9).
In version 1.4, you can add the configuration parameter "extensions.bmreplace.keep-title-default" in about:config.
Type: boolean, value: true.