Hi Krishna, 

Building extensions for Chrome and Edge would not give us full  desktop control. I would recommend using the support session, as the support session is a one time run client and is not installed on the guest machine. https://docs.connectwise.com/ConnectWise_Control_Documentation/Get_started/Remote_support_guide

I would also add that if you have a lot of customers pushing back on installing access agents, you should look at the SOS deployer extension. This extension will allow you to put a shortcut on the customer's desktop that will allow them to initiate a session when needed. 

https://docs.connectwise.com/ConnectWise_Control_Documentation/Supported_extensions/Productivity/SOS_Deployer

Please let us know if this is helpful, or if you have any additional questions. 

To our knowledge, this is not something that has changed. Please double check that EditSession permission is enabled in the role. https://docs.connectwise.com/ConnectWise_Control_Documentation/Get_started/Administration_page/Security_page/Define_user_roles_and_permissions/List_of_role-based_security_permissions

Je m'excuse pour la mauvaise traduction en français, mais voici un article de base de connaissances qui vous aidera dans votre question. https://docs.connectwise.com/ConnectWise_Control_Documentation/Get_started/Customization_guide

We'd be happy to help with this issue, please contact our support team. https://www.connectwise.com/services/support