On Apple computers with OS X < 10.9 Tor Browser won't run anymore either. Computers running Windows and are not SSE2-capable are not supported anymore. The switch to Firefox ESR 52 raises the system requirements for Tor Browser on Windows and macOS. There are already a number of bugs related to that on our radar which can be found on our bug tracker and which are tagged with the `tbb-e10s` keyword. While we are still working on the sandboxing part for Windows, both Linux and macOS have e10s and content sandboxing enabled by default in Tor Browser 7.0a3. We hope having e10s and Mozilla's content sandbox enabled will be one of the major new features in the upcoming Tor Browser 7.0 series, both security- and performance-wise. After the first nightly build based on ESR52 went out we already fixed a number of bugs associated with this switch. We updated all of our patches that did not get upstreamed yet and made Torbutton and Tor Launcher multiprocess (e10s) compatible. This is the first alpha release which is based on Firefox ESR 52.
This release features important security updates to Firefox. Tor Browser 7.0a3 is now available from the Tor Browser Project page and also from our distribution directory. Check this one out for Mozilla's reasoning behind dropping ALSA support. There is no sound on Linux systems without PulseAudio anymore.The canvas prompt is not shown anymore in Tor Browser.Tor Browser is crashing on about:addons with the security slider set to "high" and does not show any preferences on about:preferences ticked.Tor Browser is crashing when opening/downloading files that need an external application to handle them.The following list should give an overview and help to avoid duplicate bug reports: It turns out there are a number of issues that are affecting a lot of our alpha users. Update (Apr 24 8:36 UTC): Thanks to all for testing this alpha release so far. Nevertheless, we are preparing a release later this week picking this fix up and, in addition to that, a lot of other improvements for our alpha series.
By default Tor Browser users are not affected as WebGL is put behind click-to-play placeholders, thanks to NoScript. Update (May 8 10:20 UTC): Mozilla released Firefox 52.1.1esr fixing among others a security bug which could lead to a potentially exploitable crash on the Windows platform.
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