List the names of the browser that are compatible with both 'CACHEbox' and 'Fasterfox'.
select t3.name from web_client_accelerator as t1 join accelerator_compatible_browser as t2 on t2.accelerator_id = t1.id join browser as t3 on t2.browser_id = t3.id where t1.name = 'CACHEbox' intersect select t3.name from web_client_accelerator as t1 join accelerator_compatible_browser as t2 on t2.accelerator_id = t1.id join browser as t3 on t2.browser_id = t3.id where t1.name = 'Fasterfox'