You can send files up to 2.5GB using this service. Mozilla has been working on a free tool called "Firefox Send" for some time now, and it should help to alleviate the situation when required. When you upload files to the website, you can choose a password and you can choose to have downloads expire either after X days or after X downloads - for example - you can upload a set of files to be available for download only for 7 days.
Files that are sent using Send are end-to-end encrypted which means your data is secure from the moment you send it to the moment it's opened.
You can set a limit to how many times the file can be downloaded before it is deleted from the servers: one, two, three, four, five, 20, 50, or 100 times. 'With Send, your files self-destruct after download, so they can't be accessed by anyone else. "Overall, this makes the sharing experience seamless for both parties, and as quick as sending an email", Mozilla says. However, as with all file-sharing services, the easier the share, the more likely it will be used for casually passing copyrighted materials. This concept is in vogue right now; Snapchat-like impermanence was also mentioned by Facebook CEO Mark Zuckerberg as a core tenet for privacy and security in that company's stated future plans.
The announcement also states that an Android version is in the works and should be available for download soon. "So, it felt natural to graduate one of our popular Test Pilot experiments, Firefox Send, send.firefox.com". "As with all Firefox apps and services, Send is Private By Design, meaning all of your files are protected and we stand by our mission to handle your data privately and securely".