If, like me, you use Opera as your primary browser (Chrome minus Google!), and if you also want to use Dashlane as your password manager, then you have the same problem I did:
Dashlane doesn't have an Opera extension and doesn't have a Chrome extension publicly listed. (If you're a Chrome user, you know that
This post was a good starting point, but the paths are outdated (at least for Mac)
If you're running a Mac, you can just do this from the command line:
open /Applications/Dashlane.app/Contents/Library/LoginItems/P72E3GC48.com.dashlane.DashlaneAgent.app/Contents/Extensions