Given a document, generate a short title of the document. The title should convey the main idea/event/topic about which the document is being written. Note that URLs in the text have been replaced with [Link].

[Q]: Co-Founder and CEO of Vivaldi  Jon Von Tetzchner  poses for a photo during the Web Summit  Europe's biggest tech conference  in Lisbon  Portugal  November 9  2017. REUTERS/Pedro Nunes
Co-Founder and CEO of Vivaldi  Jon Von Tetzchner  talks with a Reuters reporter during the Web Summit  Europe's biggest tech conference  in Lisbon  Portugal  November 9  2017.  REUTERS/Pedro Nunes
  He  has since launched Vivaldi  which includes functions  he  says bigger browsers lack. Vivaldi.net does not track searches and is based on an online community of users who recommend features   he  said.
Co-Founder and CEO of Vivaldi  Jon Von Tetzchner  talks with a Reuters reporter during the Web Summit  Europe's biggest tech conference  in Lisbon  Portugal  November 9  2017.  REUTERS/Pedro Nunes
Google (GOOGL.O)  dominates the online advertisement market and  it  closed Vivaldiâs advertising account. Google partnered Opera before launching the Chrome browser in 2008.
 He  said  he  was increasingly concerned about data collection and tracking by tech giants like Google and Facebook.
[A]: Founder of web browser Opera says worried about online privacy


[Q]: Rhetoric between President Donald Trump and North Korean leader Kim Jong Un has escalated. In response  North Korea’s foreign minister reportedly said the nation may set off the “most powerful” hydrogen bomb detonation in the Pacific. No other details were provided  but at face value  such a blast would be 1 000 times as powerful as the Hiroshima bombing. Atmospheric testing of nuclear weapons can lead to multiple dangerous scenarios.
Ri Yong Ho  the foreign minister of the isolated nation  reportedly told journalists that North Korean leader Kim Jong Un is considering such a test blast.
“It could be the most powerful detonation of an H-bomb in the Pacific ” Yong Ho told reporters at the United Nations in New York on Thursday  according to a story by South Korea’s Yonhap News Agency. “We have no idea about what actions could be taken as it will be ordered by leader Kim Jong Un.”
caption North Korean ruler Kim Jong Un stands before what may be a miniaturized thermonuclear weapon. source Thomson Reuters
The suggestion came in response to bellicose rhetoric exchanged between US President Donald Trump and  Jong Un .
In a speech before the United Nations General Assembly on Tuesday  Trump called  Jong Un  a suicidal “rocket man” and threatened to “totally destroy” North Korea if the US is “forced to defend itself or its allies.”  Jong Un  allegedly responded with a written statement  in which he called Trump a “mentally deranged US dotard” and said that “a frightened dog barks louder.”
“Trump is basically creating audience costs for  Kim  to back down ” Jeffrey Lewis  director of the East Asia Nonproliferation Program at the Middlebury Institute of International Studies at Monterey  told Vox. “If you dare  Kim   it creates pressure for  him  to respond with  his  own provocation.”
“The stakes and heat in this conflict have not been this high since the Korean War ” Tristan Webb  a senior analyst for NK News  said in a story published by the outlet on Friday. “Kim Jong Un said in July that the … showdown was entering its final phase. He appears psychologically prepared for conflict.”
[A]: Here's what could happen if North Korea sets off a huge nuclear explosion in the Pacific Ocean Business Insider


[Q]: A Twitter user posted what appears to be a screengrab and wrote that an ISIS affiliate group broadcast a video showing the October attack that killed Sgt. La David Johnson and three other U.S. Green Berets.
Sgt.  Johnson  and three other American soldiers were killed in an ambush in Niger on Oct. 4. (Joe Raedle/Getty Images)
 Johnson   25  was part of a 12-member Army special forces unit accompanying 30 Nigerien forces when they were attacked in a densely wooded area by as many as 50 militants.
 Johnson 's widow Myeshia Johnson is presented with a folded U.S. flag by a military honor guard member during the burial service at the Memorial Gardens East cemetery. (GASTON DE CARDENAS/AFP/Getty Images)
Remains of Sgt. La David Johnson found weeks after his funeral
The gap in time led to questions about whether  Johnson  was killed in the assault and not found  or if  he  was taken away by the enemy.
According to the officials  a medical examination concluded that  Johnson  was shot as many as 18 times.
It is believed  he  died in the attack and there were no indications  he  was shot at close range  or had been bound or taken prisoner  as several media reports have suggested.
[A]:
Military probes photo purportedly showing soldier's remains