When i try to load any web oage (askubuntu.com for example), noscript addon blocks some scripts from a domain called best-deals-products.com I've searched about this topic on duckduckgo and google and result goes to lenovo and windows related products while i'm using kubuntu on my desktop computer which is not made by lenovo.
The problem is a plugin in Firefox somewhere is doing this. We have to identify and remove that plugin. There's two ways to go about that.
The destructive method:
This is essentially trying to kill a fly with a huge weapon instead of a fly swatter.
Burn (aka delete and reset) your Firefox profile, and remove all addons. Then install NoScript, and try again and see this happens. If not, then something in your profile (addons, etc.) was involved. (WARNING NOTE: Burning your firefox profile will remove all your configurations, cookies, favorites, addons, etc.)
The not-so-destructive method:
This is systematic identification and removal of the plugin causing issues.
Alternatively, a less destructive option is to disable your addons one at a time until you find the addon that is doing this, then disable/remove that addon. This will save your favorites and such.
The culprit is "1-Click YouTube Video Downloader" Firefox Addon. When I disabled it, firefox no longer visits www.best-deals-products.com automatically.