can i access svn+ssh://someAddress by webbrowser?
I don't see how that would be possible, since you need at least an accessible HTTP server. Sorry.
No, the "svn" part of that access scheme implies that the protocol to be used is svn's own, then wrapped in ssh to make it secure. Since svn is not a protocol natively supported by most web browsers, you need a svn-to-web "gateway", i.e. the svn host must also run a web server, that in turn must access the svn repositories and make them available over http.
Using SVNProtocolHandler you can visit svn:// urls in Internet Explorer. It even supports the svn+ssh:// protocol, but it requires a configured ssh client.
Note: SVNProtocolHandler is created by the primary developer of TortoiseSVN, but is not part of TortoiseSVN.
[@Stefan: Thanks for the update]