UserAgent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) coc_coc_browser/53.2.135 Chrome/47.2.2526.135 Safari/537.36

Steps to reproduce the problem:
1. open findbar, type a work on findbar, refresh the page, open findbar again, the word is still on findbar but cannot click on arrow of findbar 
2. That make me must type the work again on new or refresh page.
3. 

What is the expected behavior?
Can click on up or down arrow on findbar to prevent type the work again

What went wrong?
Can not click on up or down arrow 

Did this work before? Yes I dont remember exactly, maybe version 43 and before

Chrome version: 47.2.2526.135  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 20.0 r0