Свершилось чудо! Bug 742434 - (desktop-seccomp) Enable seccomp-bpf for nightly desktop Firefox content processes on Linux
+// This pref is introduced as part of bug 742434, the naming is inspired from
+// its Windows/Mac counterpart, but on Linux it's an integer which means:
+// 0 -> "no sandbox"
+// 1 -> "content sandbox using seccomp-bpf when available"
+// 2 -> "seccomp-bpf + file broker"
+// Content sandboxing on Linux is currently in the stage of
+// 'just getting it enabled', which includes a very permissive whitelist. We
+// enable seccomp-bpf on nightly to see if everything is running, or if we need
+// to whitelist more system calls.
+// So the purpose of this setting is to allow nightly users to disable the
+// sandbox while we fix their problems. This way, they won't have to wait for
+// another nightly release which disables seccomp-bpf again.
+// This setting may not be required anymore once we decide to permanently
+// enable the content sandbox.