yellow or red alert for 'Legacy'

For users of 56.x – and until mid 2018, users of ESR 52.x:

• there should be an upfront indication wherever an extension is legacy.

Precedents

Established use of a yellow rectangle for LEGACY at about:addons within the browser.

The subtle new look yellow alert alongside Restart required at, for example, https://addons.mozilla.org/addon/quick-locale-switcher-2/

Thoughts

The requirement for Legacy extensions to be clearly identifiable as such probably arises primarily from the new look disappearance of clear identification (green badge) wherever an extension will be compatible with Firefox 57+

As there’s space for the subtle yellow ⟲ for the relatively rare extensions that will require a restart of Firefox, there must be space for an unmistakable yellow alert for the relatively commonplace extensions that will be unusable with Firefox 57 and greater (all of which will, I guess, disappear from AMO sometime in Q4 2018).

It’s highly desirable to have the distinction at a time of increased likelihood of people ‘shopping’ for extensions ahead of the mid-November release of 57.

Urgency

If you can (please):

• Monday 2017-11-06 for a Tuesday freeze and push on Thursday 2017-11-09

– TIA.

Related

https://www.reddit.com/r/firefox/comments/7adng2/did_the_addon_page_change/dp9833c/ (9 points, recently up from 7):

How can I see if an addon is FF 57+ ready now?

https://www.reddit.com/r/firefox/comments/7adng2/did_the_addon_page_change/dp95kcl/ (17 points, rising):

… can’t tell anymore … 57 or not.

[ValentinaPC]

Verified this on AMO-dev FF56(Win 7). The new label was added. As the issue #3814 was logged separately, I think we can mark this as verified-fixed. Postfix screenshot:

[muffinresearch]

For the record @willdurand here’s a copy of the icon [1] - the copy as provided by @devaneymoz is “Not compatible with Firefox Quantum”

[1] not-compatible-min.svg.zip