<div dir="ltr"><div>Having not heard any show-stopping concerns with the plan we will start to proceed with it. In Q4 we intend to:</div><div><br></div><div>    - Migrate a few bindings and update the plan based on what we learn<br>
    - Land XUL support for Custom Elements<br>
    - Create tooling to make converting bindings easier<br>
    - Begin a bug breakdown for individual bindings<br>
<br>
    You can follow this work at the meta bug 1397874. Bgrins has made a public blog post about our plans[1], please reach out to him if you’re interested in contributing.</div><div><br></div><div>[1] <a href="https://briangrinstead.com/blog/xbl-in-firefox/">https://briangrinstead.com/blog/xbl-in-firefox/</a></div><div><br><div class="gmail_quote"><div dir="ltr">On Fri, Oct 20, 2017 at 10:47 AM Dave Townsend <<a href="mailto:dtownsend@mozilla.com">dtownsend@mozilla.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">For some time now we've been talking about moving away from XUL and XBL. The </span><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">b</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">rowser </span><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">a</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">rchitecture team has been hard at work figuring out how to go about doing that and we're ready to share the first of our proposals more widely. We have developed a plan to remove XBL from Firefox. It's been through a successful design review with some of the key engineers and now is the time for more comments if you have them. We're </span><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">planning to start</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd"> s</span><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">ome of the</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd"> work this quarter with it really ramping up next quarter.</span><div id="m_-5147112185246125444inbox-inbox-magicdomid556" class="m_-5147112185246125444inbox-inbox-ace-line"><br></div><div id="m_-5147112185246125444inbox-inbox-magicdomid1082" class="m_-5147112185246125444inbox-inbox-ace-line"><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">Take a look at <a href="https://mozilla.github.io/firefox-browser-architecture/text/0007-xbl-design-review-packet.html" target="_blank">the plan</a></span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd"> and let us know what you think. There are a couple of areas where we are still investigating concerns:</span></div><div id="m_-5147112185246125444inbox-inbox-magicdomid675" class="m_-5147112185246125444inbox-inbox-ace-line"><br></div><div id="m_-5147112185246125444inbox-inbox-magicdomid1087" class="m_-5147112185246125444inbox-inbox-ace-line"><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">Performance is of key interest</span><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">,</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd"> so we're actively doing experiments to validate that </span><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">C</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">ustom </span><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">E</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">lements can be <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1387125" target="_blank">as performant as XBL</a>.</span></div><div id="m_-5147112185246125444inbox-inbox-magicdomid1137" class="m_-5147112185246125444inbox-inbox-ace-line"><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">The plan relies on being able to use </span><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">C</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">ustom </span><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">E</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">lements in XUL</span><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">,</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd"> so we're working on getting <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1404420" target="_blank">a patch </a></span><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1404420" target="_blank"><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">for</span><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd"> that landed</span></a><span class="m_-5147112185246125444inbox-inbox-author-a-z81zz66zz65z21z65ztz88zz86zz84zguuz75zxz79z">.</span></div><div id="m_-5147112185246125444inbox-inbox-magicdomid1000" class="m_-5147112185246125444inbox-inbox-ace-line"><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">We have a list of <tree> elements in the product and we're evaluating what the future is for them.</span></div><div id="m_-5147112185246125444inbox-inbox-magicdomid1002" class="m_-5147112185246125444inbox-inbox-ace-line"><br></div><div id="m_-5147112185246125444inbox-inbox-magicdomid1098" class="m_-5147112185246125444inbox-inbox-ace-line"><span class="m_-5147112185246125444inbox-inbox-author-a-u0hiz80z6z122znz74zz70zz78zkqez72zd">Are there any other concerns that we're missing?</span></div>

</div></blockquote></div></div></div>