1. Load the testcase. 2. Open the Page Info window (press Cmd+I) JavaScript error: chrome://browser/content/pageinfo/pageInfo.js, line 987: mimeType is null I'm guessing this is a regression from bug 792968 (similar to bug 797430). https://hg.mozilla.org/mozilla-central/rev/9e32aa6fe544#l5.50 changed: > - (item instanceof HTMLObjectElement && /^image\//.test(mimeType)) || isBG) && isProtocolAllowed) { > + (item instanceof HTMLObjectElement && mimeType.startsWith("image/")) || isBG) && isProtocolAllowed) {

Confirmed on Windows, too.

Yosy, can you fix this regression from your patch?

(In reply to :Gavin Sharp (use gavin@gavinsharp.com for email) from comment #2) > Yosy, can you fix this regression from your patch? Hi, I don't have the firefox source code, I will download and compile it and will post a patch

> - (item instanceof HTMLObjectElement && mimeType.startsWith("image/")) || isBG) && isProtocolAllowed) { . + (item instanceof HTMLObjectElement && mimeType !== null && mimeType.startsWith("image/")) || isBG) && isProtocolAllowed) { Does it work if you just use "&& mimeType" instead of "&& mimeType !== null" ?

(In reply to Philip Chee from comment #5) > > - (item instanceof HTMLObjectElement && mimeType.startsWith("image/")) || isBG) && isProtocolAllowed) { > . + (item instanceof HTMLObjectElement && mimeType !== null && > mimeType.startsWith("image/")) || isBG) && isProtocolAllowed) { > > Does it work if you just use "&& mimeType" instead of "&& mimeType !== null" > ? What is the difference?

>> Does it work if you just use "&& mimeType" instead of "&& mimeType !== null" ? > What is the difference? It's shorter and easier to read and makes use of Javascript truthy/falsy behaviour: <http://james.padolsey.com/javascript/truthy-falsey/>

Comment on attachment 720096 [details] [diff] [review] Patch Yes, please remove "!== null". r=me with that change. Thanks!

Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:23.0) Gecko/20130428 Firefox/23.0 Mozilla/5.0 (X11; Linux x86_64; rv:23.0) Gecko/20130428 Firefox/23.0 Verified as fixed on Windows 7 x64 and Ubuntu 12.04 x86_64 with latest Nightly 23.0a1 (Build ID: 20130429030926)