Use Mozilla's product-details data to determine current product versions

[trev]

Background

In order to determine latest Mozilla product versions for ​https://adblockplus.org/requirements we will currently query various update servers. Not only is this approach rather complicated, it also happens to be fairly unreliable. For example, we are currently listing SeaMonkey 2.1 as compatible for some reason, probably because the update server doesn't recognize the parameters we are sending.

What to change

Download ​https://product-details.mozilla.org/firefox_versions.json for current Firefox versions (LATEST_FIREFOX_VERSION, LATEST_FIREFOX_DEVEL_VERSION, FIREFOX_AURORA, FIREFOX_NIGHTLY). Download ​https://product-details.mozilla.org/mobile_versions.json for current Firefox Mobile versions (version, beta_version, alpha_version, nightly_version). Download ​https://product-details.mozilla.org/thunderbird_versions.json for current Thunderbird versions (it seems that we need to use FIREFOX_AURORA and FIREFOX_NIGHTLY in addition to the data available there). Download ​http://www.seamonkey-project.org/seamonkey_versions.json for current SeaMonkey versions.

[sebastian]

Hey Jon, would this perhaps be something you'd like to work on, after you finished what you are currently working on? For reference, you find the code to be changed in ​get_browser_versions.py.

[saroyanm]

This also should fix #3773 I think

[trev]

I hope so. ​Bug 1246446 and ​bug 1266790 indicate that we shouldn't expect product-details.mozilla.org to be 100% reliable, even though Mozilla seems to be committed to keeping that service up. However, that domain is hosting static files only, and if there are issues these should be limited to the data being outdated.