Initial working boilerplate.

.gitignore

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+Browter.app

Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>English</string>
+	<key>CFBundleExecutable</key>
+	<string>main</string>
+	<key>CFBundleIconFile</key>
+	<string>Calculator.icns</string>
+	<key>CFBundleIdentifier</key>
+	<string>com.schoonology.Browter</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>1.0</string>
+	<key>CFBundleName</key>
+	<string>Browter</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>0.1</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleURLTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeRole</key>
+			<string>Shell</string>
+			<key>CFBundleURLName</key>
+			<string>com.schoonology.browter</string>
+			<key>CFBundleURLSchemes</key>
+			<array>
+				<string>file</string>
+				<string>http</string>
+				<string>https</string>
+			</array>
+		</dict>
+	</array>
+	<key>CFBundleVersion</key>
+	<string>0.1</string>
+	<key>LSHasLocalizedDisplayName</key>
+	<true/>
+	<key>LSMinimumSystemVersion</key>
+	<string>10.7</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+	<key>NSSupportsSuddenTermination</key>
+	<false/>
+</dict>
+</plist>

Makefile

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+all: app
+
+clean:
+	rm -rf Browter.app
+
+app:
+	mkdir -p Browter.app/Contents/MacOS
+	clang -lobjc -fobjc-arc -framework Foundation -framework AppKit main.m -o Browter.app/Contents/MacOS/main
+	cp Info.plist Browter.app/Contents/.
+	rm -rf Browter.app/Contents/MacOS/main.dSYM

main.m

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+#import <Foundation/Foundation.h>
+#import <AppKit/AppKit.h>
+
+/**
+ * Top-level object to give NSAppleEventManager something to call, as it cannot
+ * call arbitrary functions.
+ */
+@interface URLHandler : NSObject {}
+- (void)handleGetURLEvent:(NSAppleEventDescriptor *)event withReplyEvent:(NSAppleEventDescriptor *)replyEvent;
+@end
+
+@implementation URLHandler
+/**
+ * Initializes the URLHandler, wiring up the one and only event we care about.
+ */
+- (id)init
+{
+  self = [super init];
+
+  if (self) {
+    [[NSAppleEventManager sharedAppleEventManager] setEventHandler:self
+      andSelector:@selector(handleGetURLEvent:withReplyEvent:)
+      forEventClass:kInternetEventClass
+      andEventID:kAEGetURL];
+  }
+
+  return self;
+}
+
+/**
+ * Event handler fired whenever any http://, https://, or file:// URL is opened
+ * system-wide (as defined in Info.plist).
+ */
+- (void)handleGetURLEvent:(NSAppleEventDescriptor *)event withReplyEvent:(NSAppleEventDescriptor *)replyEvent
+{
+  NSString* url = [[event paramDescriptorForKeyword:keyDirectObject] stringValue];
+  NSString* app = @"Firefox";
+
+  NSLog(@"Opening %@ with %@...", url, app);
+
+  [NSTask launchedTaskWithLaunchPath:@"/usr/bin/open" arguments:@[url, @"-a", app]];
+}
+
+@end
+
+/**
+ * Initializes the process and creates our top-level object, which will handle
+ * the actual URL routing.
+ */
+int main(int argc, const char * argv[]) {
+  ProcessSerialNumber psn = { 0, kCurrentProcess };
+  TransformProcessType(&psn, kProcessTransformToBackgroundApplication);
+
+  URLHandler *handler = [[URLHandler alloc] init];
+
+  return NSApplicationMain(argc, argv);
+}