Just double click to change the value.<\/p>\n As I said before, this doesn’t affect broken images after the page has loaded, and after several searches it looks like the option just isn’t available to Fx users as a general setting. There is however a solution…<\/p>\n Firefox allows users to specify custom CSS to be applied to websites on a global basis, e.g if you want your default link colour on unvisited links to be black instead of the default blue.<\/p>\n You do this by making changes to your global content css file. You can find it at the following location (OS Specific – I’m on windows 7) \u2018%appdata%\\Mozilla\\Firefox\\Profiles\\\\chrome\u2019<\/em> (if your on a domain you will need to edit it in your roaming folder), look for a file called ‘UserContent-example.css’ and rename it to ‘UserContent.css’, this will then be loaded by Firefox when it fires up.<\/p>\n Add the following CSS to the file and restart Firefox.. Thats it… when you next come accross a broken\/missing image, you will get a box the size you have defined in its place with the alt inside it.<\/p>\n Update:<\/strong> Something that has always bugged me about Firefox is that if it encounters a broken image it doesn’t display an image place-holder. Instead it displays the alt attribute as in-line text. This can cause problems if your primary development browser is Firefox, as you may not notice broken images on a page. For a while […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[43,73,41],"tags":[163,304,27,162,165,164,26],"jetpack_featured_media_url":"","jetpack_publicize_connections":[],"_links":{"self":[{"href":"https:\/\/gavtaylor.uk\/blog\/wp-json\/wp\/v2\/posts\/334"}],"collection":[{"href":"https:\/\/gavtaylor.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gavtaylor.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gavtaylor.uk\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gavtaylor.uk\/blog\/wp-json\/wp\/v2\/comments?post=334"}],"version-history":[{"count":16,"href":"https:\/\/gavtaylor.uk\/blog\/wp-json\/wp\/v2\/posts\/334\/revisions"}],"predecessor-version":[{"id":589,"href":"https:\/\/gavtaylor.uk\/blog\/wp-json\/wp\/v2\/posts\/334\/revisions\/589"}],"wp:attachment":[{"href":"https:\/\/gavtaylor.uk\/blog\/wp-json\/wp\/v2\/media?parent=334"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gavtaylor.uk\/blog\/wp-json\/wp\/v2\/categories?post=334"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gavtaylor.uk\/blog\/wp-json\/wp\/v2\/tags?post=334"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}browser.display.show_image_placeholders<\/code><\/p>\n
\n\/* Enable image placeholders *\/
\n@-moz-document url-prefix(http), url-prefix(file) {
\nimg:-moz-broken{
\n-moz-force-broken-image-icon:1;
\nwidth:24px;
\nheight:24px;
\n}
\n}<\/code><\/p>\n
\nI was asked if I could add a broken image in this post as an example to see the css tweak in action, so here it is -> <-<\/p>\n","protected":false},"excerpt":{"rendered":"