If you're talking about Pwn2own, they've dropped Firefox
from the competition __because it was too easy to exploit__ [1].
I quote:
"For the last decade, the Pwn2own hacking competition has pitted the world's best hackers against web browsers to try and find zero-day vulnerabilities in a live event. The contest, which is sponsored by HPE and TrendMicro this year, is offering over half a million dollars in prize money, but for the first time, not a penny of that will directed to Mozilla Firefox. While Microsoft Edge, Google Chrome and Apple Safari are targets, Firefox isn't because it's apparently too easy and not keeping up with modern security: "'We wanted to focus on the browsers that have made serious security improvements in the last year,' Brian Gorenc, manager of Vulnerability Research at HPE said."
How is that for a slap in the face?
Selectively reading what you like and ignoring the rest
[an entire section in the second link is devoted to Firefox issues that have nothing to do with TBB, including the conclusion] won't change the basic facts. Another point those not in the security domain miss, is that there are plenty of exploitable bugs that are deliberately kept private. Those who have visibility in these circles (such as thegrugq) are obviously in a much better position to appraise how secure a software system really is. Trying to determine how secure Firefox is just from CVEs and bugs that are made public will only lead you to a piece of the entire puzzle. In Firefox case, even that alone should be enough to trigger RED ALERT in somebody's mind.
The best
we can all hope for is for people to stop using Firefox and flock to alternatives that raise the bar significantly.
[1] https://it.slashdot.org/story/16/02/12/034206/pwn2own-2016-w...