We are doing webdevelopment with Zope. The web-editor is just horrible. No syntax highlighting, no in-text-tabs, nothing you can work with.
I installed Zope External Editor. It is now possible that I click the "use external editor" button on every element and it creates a temporary file and opens it in Notepad++, awesome.
But one important thing fail: it doesn't save back to Zope when I save the file. I still have to copy the code back to Zope manually.
I also searched for syntax highlighting extension for chrome/firefox at least to highlight the code (but I prefer Notepad++ with upload-on-save).
Can someone help me with that?
Did you also download the ExternalEditor Helper application?
Your browser should open the helper application, which will then open the editor (which you can specify in the configuration, see last point below). This is important because the helper application is responsible for sending changes back to Zope, which it does by keeping an open WebDAV session while you are editing.
You should download the latest helper app here: http://plone.org/products/zope-externaleditor-client
From that page: