I noticed when you put your text cursor (the flashing "|" thing) on the text box of adding tags in Chrome. The button you use to enter the tags becomes the "⇥ (rightwards arrow to bar)" button.
But when I used it in Firefox, it becomes the line-break button (the arrow pointing down and to the left). I can't paste the symbol, sorry, but you can search it.
The line-break button appears when you put your cursor in this reply text box too. Although, it doesn't appear when you add tags on Chrome (because, it becomes this ⇥ instead). The line-break button appears on Firefox, for me, when I add tags.
Has anyone been able to put in custom tags on mobile?? I used to be able to do it, but for a really long time now whenever I try to enter in something in the tags part, it just moves onto the comments part