[bprasanna]

With respect to barriers, the change in APIs used to achieve the same task. For example Chrome, Edge, Opera, Brave support the extension APIs from Chrome. Whereas Firefox & Safari support the extension APIs from Mozilla. Also there is an ongoing push from Chrome to move to manifest v3 which brings in new features & security (service workers, extended scope), but that leads to rework for extensions developed in manifest v2. So, there is always a catchup to be done, if browsers introduce new APIs or change the way the APIs should be used then there is a constant effort required to keep the extensions working.