It only show a black box during the input session.

If I selected double-character font to key-in and it can't show correctly during input on input area inside of any website. It only show a black box during the input session. (Nightly V36.0a1)

You can right-click that input filed and select "Inspect Element" to open the Inspector (Firefox/Tools > Web Developer).
You can check what font is used for that text in the Font tab in the right pane of the Inspector.
If you know the correct font name that you can also try to set the correct font-family by clicking the element {} line in the Rule tab.
If that works then you can try to create a style rule for the userContent.css file or the Stylish extension.
<pre><nowiki>@-moz-document domain(ebay.com) {
input { font-family: "<font name>" !important; }
}</nowiki></pre>
The customization files userChrome.css (user interface) and userContent.css (websites) are located in the <b>chrome</b> folder in the Firefox profile folder.
*http://kb.mozillazine.org/Editing_configuration

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