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Mac OS X's Gatekeeper functionality prevents users from launching applications that haven't been code-signed, in order to help keep their computers secure. Firefox and Thunderbird releases are both signed before shipping; this article describes the process.

Signing Mozilla apps without the signing server

Firefox and Thunderbird are built using Mozilla's Release Automation infrastructure. On Mac OS X, part of this infrastructure is automatic signing of the '.app' folder using Apple's codesign tool. For projects that don't use Mozilla's Release Automation and would like to be signed for secure launching on OS 10.8 Mountain Lion and later, this guide should provide some insight into how to make sure applications are signed correctly using Apple's codesign tool. Apple's Code Signing Guide is also a good resource on the subject.

Getting a signing certificate

This article will show you how to install Thunderbird on Mac. For other operating systems, see Installing Thunderbird on Windows and Installing Thunderbird on Linux. Before you install Thunderbird, check that your computer meets the System Requirements.

In order to code-sign an application, you need a signing certificate.

While testing and debugging

For test and debug purposes, the easiest way to get a signing certificate is to use Apple's Keychain feature to create one. There are good instructions available under 'To use the Certificate Assistant to Create a self-signed signing identity'.

Visit this Apple Support page to find your Mac OS version. If you're using an outdated version of Firefox on Mac OS X 10.8 (Mountain Lion) or earlier, the only way you can update Firefox to a secure version is to upgrade your Mac OS to a version that Apple supports. Visit this Apple Support page to learn more about upgrading your Mac. To install and use Epic Browser on MAC, you need an emulator. Bluestacks is one of the most famous and popular Android emulators which can be used to install Android apps on your MAC.

For release

Creating a Developer ID requires a paid Apple Developer Account. Once you have that you can do the following to create your ID:

  1. Open the Developer Certificate Utility.
  2. Click 'Certificates' from the left hand menu.
  3. Click 'Create a Certificate' at the top right corner
  4. Select the 'Developer ID' radio button and uncheck the 'Developer ID Installer Certificate' box.
  5. Click 'Create' and follow the instructions in the wizard. It will guide you through creating a private key, certificate signing request, and importing your new Developer ID into the Keychain Access application on your Mac. If the 'Developer ID' radio button is greyed out you probably have a group account. These types of accounts only allow for the 'Agent' role to create Developer IDs. Contact the person who created your group Apple Developer Account if you get stuck here.

The codesign tool

Apple provides a tool called codesign; this command-line application is used to add a signature to an application bundle. The man page for codesign is available online, or you can simply type 'man codesign' in a Terminal window. The main options of note are:

-s your-signing-identity
Lets you specify the signing certificate you want to sign the application with your-signing-identity is the name of your certificate.
--keychain /path/to/keychain
Lets you specify which keychain contains the signing certificate specified by your-signing-identity, rather than allowing the codesign to search the keychain list. The path specified must be a full path; it's usually something similar to /Users/username/Library/Keychains/keychain-name.keychain.
--resource-rules /path/to/coderesources
Specifies a file to use when generating the rules to be applied to the code signing. When you're signing Mozilla applications with v1 signatures, you'll need to specify a custom CodeResources file here.
-f
Forces codesign to overwrite an existing signature on the application.
-v
Increases the verbosity of the codesign tool's output.
--deep
For v2 signing, sign all nested executables with the same settings. Note that you cannot specify an identifier requirement if you do this, or otherwise you need to sign the outer application again with the identifier requirement.
--requirement 'designated requirement'
Adds additional requirements for verifying the signature and application metadata. At a minimum you'll need to provide:
  • identifier: This must be the same as the value of the CFBundleIdentifier specified in your application's info.plist file.
  • leaf[subject.OU]: This needs to be the subject OU of your Developer ID. You can find it by running this command in the terminal:

Putting it all together, you'll wind up using a command similar to the one below to sign your app. You'll of course need to change the signing ID, keychain, bundle path, and requirements.

Or if you're using v2 signing, the command might look like this:

Dictation app for macbook air. Depending on your keychain preferences, the codesign command may display a popup asking for the password for the specified keychain. Once the application has been signed, the signature of an application bundle can be validated by calling:

Where Application.app is the application bundle you wish to validate. The folder will fail to validate if any of these cases occur (there may be other cases not listed here):

  • If any files that were included in the signature have been removed or modified
  • If any files have been added to a folder that should have all files signed

The CodeResources file

This file is located in your application's bundle at Contents/_CodeSignature/CodeResources. If you don't provide one, codesign will automatically generate it. However, to modify Apple's automatic signing process (for example, to exclude a file or folder), you'll need to provide this file. Once the application bundle is signed, this file will contain the hashes/checksums of all files that are included in the signature. If any file is subsequently changed, the folder will no longer validate.

The CodeResources file used to sign official Firefox and Thunderbird builds is available in mozilla-central. For more details on using the CodeResources file, refer to the Code Resources section on Erick Dransch's blog post about code signing.

See also

Some good resources for code signing for Mac OS X are available at:

  • Signing Mac builds on Erick Dransch's blog
  • Ping erick, bhearsum, or smichaud in the #developers channel on IRC for more information
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Shape Up Your Floats

CSS Shapes lets a floated element sculpt the flow of content around it beyond the classic rectangular bounding box we’ve been constrained to. For instance, in the above screenshot and linked demo, the text is wrapping to the shape of the grapes vs the image’s border. There are properties for basic shapes all the way up to complex polygons. There are of course great docs on all of this, but Firefox 62 also includes new tooling to both inspect and visually manipulate CSS Shapes values.

You can learn more in Josh Marinacci’s post on the new CSS Shapes tooling from yesterday.

Variable Fonts Are Here

No punny title, I’m just excited! OpenType Font Variations allow a single font file to contain multiple instances of the same font, encoding the differences between instances. In addition to being in one file, font creators can expose any number of variation axes that give developers fine-grained control on how a font is rendered. These can be standard variations like font weight (font weight 536 looks right? no problem!) or things that were never previously available via CSS (x-height! serif-size!). In addition to the candy-store possibilities for typography nerds, being able to serve a single file with multiple variants is a major page weight savings. Dan Callahan goes much deeper on the grooviness to be found and how Firefox makes it easy to tweak these new custom values.

Mozilla For Mac Os X

Devtools Commands

The Developer Toolbar was an alternate command repl input in the Firefox Developer tools, apart from the Web Console. I say “was” because as of Firefox 62, it has been removed. It was always a bit hard to find and not as well-advertised as it could be, but did encapsulate some powerful commands. Most of these commands have been progressively migrated elsewhere in the devtools, and this is wrapped up in Firefox 62, so we’ve removed the toolbar altogether.

One of the last commands to be migrated is screenshot, which is a power-user version of the “take a screenshot” button available in the devtools UI. The screenshot command is now available as :screenshot in the Web Console. For example, have you ever needed a high-res screenshot of a page for print? You can specify a higher pixel density for a screenshot via the command: :screenshot --dpr 4

There are a bunch of other options as well, such as specifying output filenames, capture delays, and selector-cropped screenshots. Eric Meyer wrote a great primer on the power of :screenshot on his blog, and it will change your page capture game.

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Mo’ Pixels, Mo’ Panels

Do you have a 4k monitor? Do your browser windows bathe in a wash of ample screen real-estate? Let your devtools stretch their legs with a new 3-column mode in the Page Inspector. You can now pop the CSS Rules view into its own column, to let you view style information and the excellent Grid tooling or Animations panel side-by-side.

What's New:

The latest version of Mozilla’s Firefox browser, out now for Windows, macOS, Linux and Android, now blocks third-party tracking cookies and cryptominers by default.

New:

  • The baseline interpreter for JavaScript bytecode execution is now enabled
  • The developer tools accessibility panel now includes an audit for keyboard accessibility
  • The developer tools accessibility panel now includes a color deficiency simulator for systems with WebRender enabled
  • When focused on a toolbar button, users can now type the first (or first few) characters of another button's name to jump directly to that button.
  • Inactive CSS: The Inspector now grays out CSS declarations that don’t affect the selected element and shows a tooltip explaining why.

Fixed: Burnx.

  • macOS: Vastly reduced power consumption with a more efficient compositor

Changed:

  • Built-in Firefox pages now follow the system dark mode preference
  • WebRender enabled by default for Windows desktops with Integrated Intel graphics for Low Resolution devices
  • Aliased theme properties have been removed, which may affect some themes
  • The Firefox Accounts toolbar menu has been updated and reorganized to give faster access to account features and services.

Developer:

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  • Write snippets of code and iterate on them faster in the WebConsole with the
  • new multi-line editor mode. The Enter key adds new lines like in a regular editor. Evaluate with Ctrl + Enter (Cmd + Enter on OSX).
  • Firefox now supports the CSS properties 'text-decoration-thickness' and 'text-underline-offset', which let web developers control the position and size of text decoration lines.
  • Firefox now supports the CSS property 'text-decoration-skip-ink', which (by default) makes underlines and overlines skip over any text that they intersect, to improve readability.
  • DOM Breakpoints in Developer Tools allows diagnose with code in a page changes a specific DOM node, including the node's children

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