Hi. I'm a user of OpenVPN which uses TAP (a virtual network adapter) to establish VPN connections. Sometimes I need to switch VPN on/off when browsing websites, but I didn't find options like "select a network adapter to use" within Firefox. Currently the only solution is to connect/disconnect OpenVPN to switch VPN on/off, but it's quite inconvenient for me. I've tried searching for add-ons about this, but a possible one named "FoxyProxy" has dropped this feature recently because of the changes about Firefox API, so I think my problem can be no longer solved by add-ons. Any solutions to this? Can I have this feature provided by Firefox with updates if there isn't any workaround for now?