If you try to replace "Foo" with " Foo " the extension says that it will do the replacement on x pages however replacements are not done.
Topic on Extension talk:Replace Text
Fixed. If you are on REL1_35 move to the latest revision.
[FIXED] Tracked with task T293769.
If you try to replace "Foo" with " Foo " the extension says that it will do the replacement on x pages however replacements are not done.