Hi yes, is working as intended. Firefox, Sandbox, Extensions all show up as processes. Just need to worry if they become excessive in going through ram (which you do not mention) or do not shutdown when Firefox is shut down.

• https://www.howtogeek.com/332449/whats-new-in-firefox-quantum/
• https://www.howtogeek.com/334594/stop-complaining-that-your-browser-uses-lots-of-ram-its-a-good-thing/

They days of 4-8gigs of ram are long over; 16 is minimum that should have and I have 32gig on this one.

Please let us know if this solved your issue or if need further assistance.

It is possible to limit the amount of processes but if your computer is running fine then there is no point. Being a Multi-processor and Multi-thread browser takes advantage of your CPU cores. But here is info : Go the 3 Bar Menu then Options --> General --> Performance and untick everything. change the recommended size lower then see how it runs. Note: 1 = No Multiprocessor = slow again. Try 2 or go higher, find the sweet spot. Restart Firefox after making these changes please.

Note the number it is using has no correlation to the amount of CPU cores you have. As I have a Core 4 and have another that is 8 cores.

If worried about things can always give your self a scan : Please use more than 1 scanner as each uses diff tech :

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware

Save your Report and google each before deleting anything as do not want to delete something you need, If need help :

• https://forums.malwarebytes.com/topic/9573-im-infected-what-do-i-do-now/

Post in only 1 forum, then wait.

Please let us know if this solved your issue or if need further assistance.