1. How to use extensions? I can create one (it looks like a javascript function getting some context and one argument) but I have no idea how to invoke it. I expected to be able to invoke them on selected text.
2. Does it sync on other computers / browsers or is it only local?
Sorry for lacking documents and guidance. When you enable a script, you can trigger it by typing 「/」 in command palette （cmd + k）. Currently, the selected text only works with the prompt. You reminded me that the script should also be able to handle selected text, and I will add this feature.
1. How to use extensions? I can create one (it looks like a javascript function getting some context and one argument) but I have no idea how to invoke it. I expected to be able to invoke them on selected text.
2. Does it sync on other computers / browsers or is it only local?