They could be on the hook, except the ToS of Firefox Send includes this language: You hereby represent and warrant that your content will not infringe the righ

They could be on the hook, except the ToS of Firefox Send includes this language: You hereby represent and warrant that your content will not infringe the rights of any third party and will comply with any content guidelines presented by Mozilla... We may suspend or terminate your access to the Services at any time for any reason, including, but not limited to, if we reasonably believe:... you create risk or possible legal exposure for us... You agree to defend, indemnify and hold harmless Mozilla [et al] from and against any and all third party claims and expenses, including attorneys' fees, arising out of or related to your use of the Services (including, but not limited to, from any content uploaded by you). (https://www.mozilla.org/en-US/about/legal/terms/services/#send https://www.mozilla.org/en-US/about/legal/terms/services/#se...)