I use Huawei EMUI desktop mode with an external monitor. Firefox generally works fine but does not have any right mouse click function. Opera does but opera ceases functioning whenever my phone screen goes to sleep. Firefox does not and I use firefox on everything and want to use it in android desktop mode. I can not for instance open a youtube video or wiki link in a new tab or copy and search or paste. Firefox can do all this with touch but not with a mouse. Opera has right mouse click function, why not Firefox.
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