odoo/addons/plugin_thunderbird/plugin_thunderbird.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="view_thunderbird_installer" model="ir.ui.view">
            <field name="name">plugin_thunderbird.installer.view</field>
            <field name="model">plugin_thunderbird.installer</field>
            <field name="inherit_id" ref="base.res_config_installer"/>
            <field name="arch" type="xml">
                <data>
                    <form position="attributes">
                        <attribute name="string">Install Thunderbird Plug-In</attribute>
                    </form>
                    <xpath expr="//footer" position="replace"/>
                    <xpath expr="//separator[@string='title']" position="after">
                        <group>
                            <field name="thunderbird" invisible="1"/>
                            <field name="plugin_name" invisible="1"/>
                            <field name="plugin_file" filename="plugin_name" widget="url"/>
                            <field name="pdf_file" widget="url"/>
                        </group>
                        <separator string="Installation and Configuration Steps"/>
                        <p>Thunderbird plugin installation:</p>
                        <ul>
                            <li>1. Save the Thunderbird plug-in.</li>
                            <li>2. From the Thunderbird menubar: Tools ­> Add-ons -> Screwdriver/Wrench Icon -> Install add-on from file...</li>
                            <li>3. Select the plug-in (the file named openerp_plugin.xpi).</li>
                            <li>4. Click "Install Now".</li>
                            <li>5. Restart Thunderbird.</li>
                            <li>6. From the Thunderbird menubar: OpenERP -> Configuration.</li>
                            <li>7. Configure your openerp server.</li>
                        </ul>
                    </xpath>
                    <separator string="title" position="attributes">
                        <attribute name="string"></attribute>
                    </separator>
                </data>
            </field>
        </record>

        <record id="action_thunderbird_installer" model="ir.actions.act_window">
          <field name="name">Install Thunderbird Plug-In</field>
          <field name="type">ir.actions.act_window</field>
          <field name="res_model">plugin_thunderbird.installer</field>
          <field name="view_id" ref="view_thunderbird_installer"/>
          <field name="view_type">form</field>
          <field name="view_mode">form</field>
          <field name="target">new</field>
        </record>

        <!-- Sales Configuration -->
        <record id="view_config_thunderbird_installer" model="ir.ui.view">
            <field name="name">Sales Application</field>
            <field name="model">sale.config.settings</field>
            <field name="inherit_id" ref="base_setup.view_sale_config_settings"/>
            <field name="arch" type="xml">
                <div name="module_plugin_thunderbird" version="7.0" position="replace">
                    <div>
                        <field name="module_plugin_thunderbird" class="oe_inline"/>
                        <label for="module_plugin_thunderbird"/>
                        <button name="%(action_thunderbird_installer)d" type="action" string="Download and install the plugin" icon="gtk-execute"
                            attrs="{'invisible': [('module_plugin_thunderbird','=',False)]}" class="oe_link"/>
                    </div>
                </div>
            </field>
        </record>

<!--      <menuitem id="base.menu_base_config_plugins" name="Plugins" parent="base.menu_base_config" sequence="10"/>-->
        <menuitem id="menu_base_config_plugins_thunderbird" action="action_thunderbird_installer" parent="base.menu_base_config" sequence="10"/>

    </data>
</openerp>