What is email@example.com file
firstname.lastname@example.org is an extension associated with Mozilla Firefox. The file is located in the ‘c:\users\%USERNAME%\appdata\roaming\mozilla\firefox\profiles\f1z4mjgy.default-1495398893652\extensions\’ folder. However, the file is marked as safe but this may create trouble for users, if it gets infected. Also, it does not a visible interface and just works as a background to support the application. It is no doubt that email@example.com is a legitimate executable file that is necessary for the working of Mozilla Firefox.
But, if you are facing troubles because of this file then it may possible that your computer might have got the infected or the malicious version of the file. Many cyber offenders imitates the name of legitimate files to intrude inside the users PC and performs malicious actions. You must check the location of the file firstname.lastname@example.org and if it is located somewhere else, then it is a malicious file. Also if the file is illegitimate, it will take huge CPU resources for illegal actions like mining of digital currency, establishing remote connections and receiving instructions from unknown servers and so. Quickly run a powerful scan to your computer in order to detect any malicious program.