Preliminary Checks

• I have read and understood the important section above.
• I have searched existing issues and avoided creating duplicates.
• I am not filing an enhancement request.
• I have checked that this issue cannot be reproduced on Mozilla Firefox.
• I have checked that this issue can be reproduced once I removed all my Mods and Custom CSS.

What happened?

i saw a bunch of New Tab on task manager every create new tab or to access something through address bar. sometimes this process make burden the cpu and gpu. it is normal ?, or just i don't know how firefox browser work.

Expected behavior

new tab created and render the website normally

Actual behavior

new tab created, but leave a lot of new tab process in background

Steps to reproduce

create new tab, and look at the about:processes

Screenshots and videos

Version

1.15.2b (Firefox 142.0.1) (64-bit)

What platform are you seeing the problem on?

Windows - x64

What component is this issue related to?

Performance

Relevant log output if applicable