More than one process is normal for the current Firefox. http://www.ghacks.net/2016/07/22/multi-process-firefox/

Multi-process Firefox is codenamed "e10s". https://wiki.mozilla.org/Firefox/multiprocess

Try to disable multi-process tabs in Firefox. You can disable multi-process tabs in Firefox by setting the related prefs to false on the about:config page.

browser.tabs.remote.autostart = false browser.tabs.remote.autostart.2 = false

Type about:config<enter> in the address bar. If a warning screen comes up, press the I Accept the Risk button. At the top of the screen is a search bar.

hi, firefox has been turned into a multi-process application - various tasks are put into separate processes which brings benefits in terms of performance, security and stability: https://blog.mozilla.org/futurereleases/2016/08/02/whats-next-for-multi-process-firefox/ https://wiki.mozilla.org/Electrolysis

the ram usage shown in your screen-shot is negligible/low for a modern browser and you shouldn't need to worry about that...