Arthur Edelstein authored Nov 11, 2015 and Georg Koppen committed Dec 07, 2015

Changes include:
0. Logo changed to prettier onion
1. Title changed to "Welcome to Tor Browser" (in purple).
2. Dropped "This browser is configured to use Tor."
3. Normal style for "You are now free to browse the Internet anonymously."
4. Border on input box set to light gray, rounded corners removed
5. Search button image replaced with non-pixellated one
6. Sans-serif text used everywhere
7. Borders on bubbles removed
8. Text color changed to be slightly less black
9. Some text increased a little in size

Avoid hard-coded heights and positions in about:tor. The "update needed"
  arrow is now constructed from 4 elements instead of 2 and the info.
  "bubbles" use table layout instead of hard-coded heights.
Set the CSS z-index so that text will be in front of the status image
  (onion image) and the "update needed" arrow.
Use "let" instead of "var" in the about:tor JS code.

In particular: Don't steal focus from the URL bar.

In Firefox 26 and newer, the BrowserOnAboutPageLoad() function that
Torbutton previously used to detect about:tor page loads has been removed.
The new approach is to have about:tor dispatch a custom event (which is
the same approach Mozilla uses for about:home).

This problem occurred in some non-English locales (e.g., de).
We now reduce the font size of some elements if necessary.

We now position the arrow so it points to the toolbar button regardless
of its position.

Our use of entities that contained trailing spaces was a bad idea:  they
got lost during the translation process.  Instead, we now use a template
that contains a snippet of HTML, with the search engine URLs as separate
property strings.

We did our best to preserve the existing translated strings, converting
them to the new scheme and adding the missing spaces.

Avoid empty entity strings in DTD and add explanation for translators.
Remove trailing ? from Startpage privacy URL.

Instead of a remote check, we now check browser proxy settings against the
values specified by the tor control port.

If the control port is unavailable or broken, we send background request to
check.torproject.org and update the about:tor homepage and torbutton icon
retroactively if that fails.