Didn't seem to work for a while; but then I don't know what the definition of a "text box" is.

I really like this extension. Please, make copying possible even in text boxes

亮点：
可以过滤换行符。
不足：
经查用一段时间后，不起作用，须停用后再启用，才起作用。

I would like it to be copied when selected with the mouse in one direction, for example, from left to right, because sometimes you have to select pieces of text for deletion, but copying takes place and you cannot delete the text) you have to select with a mouse click while holding down the shift key, which is not conveniently
Thank you

It works nicely on FF57! Thanks!

Update:
After using this add-on a day, i realize that you could add an option to turn off the pop up notification that appear on the bottom of the screen, after a while it becomes very annoying!