![Why does Firefox consume a lot of CPU even when closed? I thought an update was in progress, so I let it run for an hour, but it still used 50% CPU. Why does Firefox consume a lot of CPU even when closed? I thought an update was in progress, so I let it run for an hour, but it still used 50% CPU.](https://preview.redd.it/why-does-firefox-consume-a-lot-of-cpu-even-when-closed-i-v0-ouf98z84jlfa1.png?width=640&crop=smart&auto=webp&s=8f784d30eacdcf6d67ffa496d9738c051f1da413)
Why does Firefox consume a lot of CPU even when closed? I thought an update was in progress, so I let it run for an hour, but it still used 50% CPU.
![Limit CPU and Memory to Firefox and chrome web-browser on a Linux desktop | by Ramesh Sahoo | Medium Limit CPU and Memory to Firefox and chrome web-browser on a Linux desktop | by Ramesh Sahoo | Medium](https://miro.medium.com/v2/resize:fit:701/1*xGNuas_P9ZapHw9rQPKtUg.jpeg)
Limit CPU and Memory to Firefox and chrome web-browser on a Linux desktop | by Ramesh Sahoo | Medium
![Firefox constant 25% cpu usage in SANDBOXIE - Sandboxie Forum (Read Only) - Sandboxie (Read Only) - Sophos Community Firefox constant 25% cpu usage in SANDBOXIE - Sandboxie Forum (Read Only) - Sandboxie (Read Only) - Sophos Community](https://community.sophos.com/cfs-file/__key/communityserver-discussions-components-files/252/Bug2.png)
Firefox constant 25% cpu usage in SANDBOXIE - Sandboxie Forum (Read Only) - Sandboxie (Read Only) - Sophos Community
![firefox - Debugging high (near total) CPU/memory usage of "Web Content" application on Linux Mint - Unix & Linux Stack Exchange firefox - Debugging high (near total) CPU/memory usage of "Web Content" application on Linux Mint - Unix & Linux Stack Exchange](https://i.stack.imgur.com/D8KzA.png)