Keyboard Input Source automatically changed on focusing input field
Whenever I focus input fields, Firefox automatically switch keyboard input source to Hangul (Korean). For example, If I focus a input field, Firefox changes the input source to Hangul. So I changed the input source to English manually and then if I focus other input field, Firefox changes the input source to Hangul again. I have two input sources on my mac. ABC (English) and 2-Set Korean and English is higher priority. I checked this on Chrome and Safari, both browser keep the input source.
This is my environment. Mac OS : macOS Big Sur Version 11.2.3 (20D91) Firefox : 86.0.1 (64-bit)