cn.bing.com search url broken to https://cn.bing.com/?bbtnserp=1&bbtnfrm

[ZgblKylin]

When launch a new tab with pure bing search url like https://cn.bing.com/search?q=roblox%20unity,
the search page opens correctly, but after ~2s, the url flash quickly and become https://cn.bing.com/?bbtnserp=1&bbtnfrm.

But if I disable ClearURLs, after the url flashed, it still stays as https://cn.bing.com/search?q=roblox%20unity.

Is it caused by some tracking scripts in cn.bing.com? But if I open url in an existings tab, the url flash won't happen -- it only happens in new tab.

Tested with only ClearURLs extension enabled, with AdGuardHome to prevent DNS pollution.

Not tested for www.bing.com, since it's redirected to cn.bing.com automatically in china mainland network.

• Firefox version: nightly 145.0a1 (2025-09-16) (64 bit)
• Extension version: 1.27.3

Logs:

before	after	rule	time
https://cn.bing.com/?form=SPHPRE1&bbtnserp=1&bbtnfrm=	https://cn.bing.com/?bbtnserp=1&bbtnfrm=	form	2025/9/24 00:03:19
https://cn.bing.com/AS/Suggestions?pt=page.serp&bq=roblox+unity&ds=mobileweb&qry=roblox+unity&csr=1&pths=1&rqry=1&zis=1&pf=1&cvid=5B3F7E69B5B4481CB7237A0DBBA305D2&ajaxreq=1	https://cn.bing.com/AS/Suggestions?pt=page.serp&bq=roblox+unity&ds=mobileweb&qry=roblox+unity&csr=1&pths=1&rqry=1&zis=1&pf=1&ajaxreq=1	cvid	2025/9/24 00:03:18