What does Reverse Button look like on Mozilla?

On Mozilla it is the design shipped in Firefox OS 2.5, shown above at full size. Older revisions are listed beneath it.

When did Mozilla add Reverse Button?

Mozilla first drew Reverse Button in Firefox OS 2.5, released January 30, 2016.

Mozilla Foundation has shipped 1 version of Reverse Button. Each is dated, so you can see when the design changed.

Mozilla Firefox OS 2.5

Mozilla shipped a new design for Reverse Button in Firefox OS 2.5, released January 30, 2016. The previous design is shown beside it.

The first Mozilla release we hold for this emoji.

✳ marks a release that redrew this emoji. The rest re-shipped the design unchanged.

What does Reverse Button look like on Mozilla?: On Mozilla it is the design shipped in Firefox OS 2.5, shown above at full size. Older revisions are listed beneath it.
When did Mozilla add Reverse Button?: Mozilla first drew Reverse Button in Firefox OS 2.5, released January 30, 2016.
How many times has Mozilla redrawn Reverse Button?: Mozilla Foundation has shipped 1 version of Reverse Button. Each is dated, so you can see when the design changed.