skipping the firefox version validation if firefox is not the browser being used
Merge pull request #5391 from edx/clytwynec/skip_firefox_version_check_if_not_using_firefox

skipping the firefox version validation if firefox is not the browser be...
Add molecule viewer tool to Exercises and Tools section
Merge pull request #5273 from edx/sylvia/docs/DOC-759

Sylvia/docs/doc 759
add Solano CI.
Merge PR#3. Solano: Add post worker hook for copying artifacts.
fixed capturing screenshots
adding post worker script
fixing file log error
introduce bok-choy shards, new firefox version
re-shard lms to fix a failing test.
Add quality report capability.