If you need to copy the URL address from Firefox toolbar, you need to tap the URL once, wait, then tap second time to Amdroid's native [Firefox | Copy | Cut | Select all] bar to appear.
Currently FF only shows buttons:
[Scan] [Search Engine]
Could there be also [Copy] button?
[Copy] [Scan] [Search Engine]
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It's possible to copy the URL faster. From the website, we only need to longpress the URL once and a Copy option will apear, withoud being shown the "Home" page. (Sorry if the image quality is low...)