Since some time now, let's say almost 1 year, I have up to 40% CPU usage for Firefox (plus over 2GB of memory). If it's running more than 1 day, it's up, I have to restart it that this goes away, but only for a short time.

It's not that big of a deal, as almost everything still works fine, but working on my NAS through the web interface is WAAAAY too slow, meaning in file manager I click on one folder, it needs up to 15 seconds to open it, very annoying, so I must restart, otherwise it's impossible to work with.

I browsed several sites for help, did try a lot so far, but without any success. I don't have a lot of add-on running either, so I doubt it's a problem:

- Adblock Plus 2.9.1
- Bitdefender Wallet 4.2.5 (that one's quite new, and the problem exists already way before that)
- Classic Theme Restorer
- FlashhGot
- Image Zoom
- Tab Mix Plus
- Video DownloadHelper 6.3.1