Disable TinyMCE absolute to relative URL Conversions

Set convert_urls: false in tiny_mce_init.js, not tiny_mce.js. Early in tiny_mce_init.js you’ll see a call to window.tinyMCE.init passing a bunch of initialisation options. In the Products.TinyMCE I’m looking at, the last option is fix_list_elements: false. Add your option there.

Edit: tiny_mce_init.js is no longer used in Products.TinyMCE 1.3.x (Plone 4.3). Instead, override the tinymce-jsonconfiguration browser view, e.g.:

Assuming you have a package with a browser layer, add in browser/configure.zcml:

<browser:page
    for="*"
    name="tinymce-jsonconfiguration"
    class=".tinymce.TinyMCEBrowserView"
    permission="zope2.View"
    attribute="jsonConfiguration"
    layer="..interfaces.IMyBrowserLayer"
    />

Then add browser/tinymce.py:

try:
    import simplejson as json
except ImportError:
    import json

from Acquisition import aq_inner
from Products.CMFCore.utils import getToolByName
from Products.TinyMCE.browser.browser import TinyMCEBrowserView as View
from Products.TinyMCE.browser.interfaces.browser import ITinyMCEBrowserView
from zope.interface import implements


class TinyMCEBrowserView(View):
    implements(ITinyMCEBrowserView)

    def jsonConfiguration(self, field):
        """Return the configuration in JSON"""

        utility = getToolByName(aq_inner(self.context), 'portal_tinymce')
        config = utility.getConfiguration(context=self.context,
                                          field=field,
                                          request=self.request)
        config['convert_urls'] = False
        return json.dumps(config)