On opera and firefox, there's a possibility to eliminate one request towards github

[rasjani]

both get_download_url & get_download_path make a call towards github api end point. If both calls are made with same version (as happens if cli download is used) - we could cache the result. Another approach would be to refactor the base class so that both calls arent needed.

[rasjani]

incoming ie branch utilizes caching of the results, something similar should be done for firefox and opera..