I tried the @MaxZieb and @MarkHunte extension "hypeDocument.setInnerHtmlByClass".
This works great but I'm looking for a way to change more classes at the same time.
What I am trying to do is the following.
I have a lot of elements with a unique class. Using a button, I can show text inside the element. Now I want to change the text. No problem. Example: text is Eb in class 'root' and Bb in class 'fifth'. Change this into resp. D# and A#. No problem. But a little later text is Eb in class 'fifth' and Bb in class 'root'.
Is there a way to collect all these classes and change and reverse the texts in one go?