diff --git a/addons/web/models/ir_qweb.py b/addons/web/models/ir_qweb.py
index 0a5e0deb4e9..972ae4d813d 100644
--- a/addons/web/models/ir_qweb.py
+++ b/addons/web/models/ir_qweb.py
@@ -65,7 +65,7 @@ class Image(models.AbstractModel):
         atts["data-zoom"] = src_zoom and u'1' or None
         atts["data-zoom-image"] = src_zoom
 
-        atts = self.env['ir.qweb']._post_processing_att('img', atts, options)
+        atts = self.env['ir.qweb']._post_processing_att('img', atts, options.get('template_options'))
 
         img = ['<img']
         for name, value in atts.items():
diff --git a/addons/web_editor/models/ir_qweb.py b/addons/web_editor/models/ir_qweb.py
index 4a41ff572bb..6802091d4c4 100644
--- a/addons/web_editor/models/ir_qweb.py
+++ b/addons/web_editor/models/ir_qweb.py
@@ -173,6 +173,7 @@ class Contact(models.AbstractModel):
     @api.model
     def attributes(self, record, field_name, options, values):
         attrs = super(Contact, self).attributes(record, field_name, options, values)
+        options.pop('template_options') # remove options not specific to this widget
         attrs['data-oe-contact-options'] = json.dumps(options)
         return attrs
 
diff --git a/odoo/addons/base/ir/ir_qweb/fields.py b/odoo/addons/base/ir/ir_qweb/fields.py
index 1f4475824bc..19e15ff4621 100644
--- a/odoo/addons/base/ir/ir_qweb/fields.py
+++ b/odoo/addons/base/ir/ir_qweb/fields.py
@@ -261,7 +261,7 @@ class HTMLConverter(models.AbstractModel):
         for element in body.iter():
             if element.attrib:
                 attrib = OrderedDict(element.attrib)
-                attrib = irQweb._post_processing_att(element.tag, attrib, options)
+                attrib = irQweb._post_processing_att(element.tag, attrib, options.get('template_options'))
                 element.attrib.clear()
                 element.attrib.update(attrib)
         return etree.tostring(body, encoding='unicode', method='html')[6:-7]
@@ -488,7 +488,7 @@ class Contact(models.AbstractModel):
             'object': value,
             'options': options
         }
-        return self.env['ir.qweb'].render('base.contact', val)
+        return self.env['ir.qweb'].render('base.contact', val, **options.get('template_options'))
 
 
 class QwebView(models.AbstractModel):
diff --git a/odoo/addons/base/ir/ir_qweb/ir_qweb.py b/odoo/addons/base/ir/ir_qweb/ir_qweb.py
index 105c12f7b08..1c2f07185ae 100644
--- a/odoo/addons/base/ir/ir_qweb/ir_qweb.py
+++ b/odoo/addons/base/ir/ir_qweb/ir_qweb.py
@@ -51,21 +51,7 @@ class IrQWeb(models.AbstractModel, QWeb):
             if method.startswith('render_'):
                 _logger.warning("Unused method '%s' is found in ir.qweb." % method)
 
-        def jsonable(val):
-            try:
-                json.dumps(val)
-                return True
-            except Exception:
-                return False
-
-        context = {
-            key: val
-            for key, val in self.env.context.items()
-            if isinstance(key, pycompat.string_types) and not key.startswith('_')
-            if jsonable(val)
-        }
-        context['dev_mode'] = 'qweb' in tools.config['dev_mode']
-        # context = dict(self.env.context, dev_mode='qweb' in tools.config['dev_mode'])
+        context = dict(self.env.context, dev_mode='qweb' in tools.config['dev_mode'])
         context.update(options)
 
         return super(IrQWeb, self).render(id_or_xml_id, values=values, **context)
@@ -369,8 +355,7 @@ class IrQWeb(models.AbstractModel, QWeb):
         field = record._fields[field_name]
 
         # adds template compile options for rendering fields
-        for k, v in options.items():
-            field_options.setdefault(k, v)
+        field_options['template_options'] = options
 
         # adds generic field options
         field_options['tagName'] = tagName
@@ -392,6 +377,9 @@ class IrQWeb(models.AbstractModel, QWeb):
         return (attributes, content, inherit_branding or translate)
 
     def _get_widget(self, value, expression, tagName, field_options, options, values):
+        # adds template compile options for rendering fields
+        field_options['template_options'] = options
+
         field_options['type'] = field_options['widget']
         field_options['tagName'] = tagName
         field_options['expression'] = expression