bitmask wheezy dependencies not met

i did a fresh wheezy install last weekend and decided to try to follow the instructions on the website to install the package.

unfortunately:

# apt-get install bitmask leap-keyring
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 bitmask : Depends: soledad-client (>= 0.5.0) but it is not going to be installed
           Depends: leap-mail (>= 0.3.9) but it is not going to be installed
           Depends: python-keyring (>= 0.9.2) but 0.7.1-1+deb7u1 is to be installed
           Depends: python-jsonschema (>= 0.7.0) but 0.2-1 is to be installed
           Recommends: xul-ext-bitmask but it is not installable

(from redmine: created on 2014-07-04, closed on 2014-07-04, relates #5868 (closed))