geckodriver errors on unknown capabilities, let's make these conditional
geckodriver errors on unknown capabilities, let's make these conditional

forgot to commit this, remove ie option from conftest

fix for local firefox, it dislikes platform capability

fix for local firefox, it dislikes seleniumVersion capability

fix for local firefox, it dislikes tunnel-identifier capability

fix typo

firefox dislikes version capability too

self = <selenium.webdriver.remote.errorhandler.ErrorHandler object at 0x7f0b016922e8>
response = {'status': 400, 'value': '{"value":{"error":"invalid argument","message":"version was not a the name of a known capabi...            at /buildslave/rust-buildbot/slave/stable-dist-rustc-musl-linux/build/src/libstd/sys/unix/thread.rs:84"}}'}

jdanekrh/dispatch-console-tests,jdanekrh/dispatch-console-tests