Lead Connect is a browser specific tool, and when you change your browser all the data along with your sequences wont be migrated unless you migrate the data as well.
In order to get back your sequences on new browser follow these steps: (Make sure you have not uninstall extension from old browser, because when you uninstall extension, data is erased along with it)
- Navigate to:
Windows Systems: *"C:\Users\%USERNAME%\AppData\Local\Google\Chrome\" (If not visible go to folder options and enable show hidden folders option) * Where %USERNAME% = Your Username. (e.g. if your username is "Admin", then you have to navigate to this path: "C:\Users\Admin\AppData\Local\Google\Chrome")
Mac OS X El Capitan: Users/<username>/Library/Application Support/Google/Chrome/
Linux: /home/<username>/.config/google-chrome/
2. Copy the whole folder and paste it to your new system at the same location
After this you should be good to go. Once you verify please don't use old browser to run the same sequences as it could result in unexpected behaviors.
Ref: https://www.repairwin.com/recover-deleted-bookmarks-passwords-settings-chrome/
This article can help you recover lost data also some cases.