We have CISCO Webex productive tool 31.4 version in production. However we are using Firefox ESR versions in our environment. We found that Cisco webex is working till Firefox ESR 45.9 versions. Issue occurs from ESR 52.2.0 on wards. In order to resolve this issue users need to install webex addon manually which is not possible due to not having admin rights to make changes on their machines. And, We can not instruct user to use old versions of Firefox ESR. Please provide a solution on this?