Bug#869533: While browsing the source "Open link in New Tab" does not always work

[local10]

Package: firefox-esr                     
Version: 52.2.0esr-1~deb7u1

While browsing the source, "Open link in New Tab" does not always work, seemingly it does not work more often than it does. For example, browsing the following code snippet from  https://www.rt.com/news/397275-maks-airshow-2017-highlights and trying to "Open link in New Tab" did nothing for me for the links[1][2] in the code snippet below. However, manually copying the link location then  opening a tab and then pasting the location in the url bar works fine. Any ideas? Thanks

[1] https://www.rt.com/news/397195-t50-sukhoi-stealth-fighter-maks
[2] https://www.aviasalon.com/ru/news/item/news_id-476.htm

Code example:

<a href="https://www.rt.com/news/397195-t50-sukhoi-stealth-fighter-maks" target="_blank" rel="noopener noreferrer">READ MORE: Russia’s Sukhoi T-50 fighter proves ‘no physical limits exist for pilots’ (VIDEOS)</a></strong></p><p>Some 800 airspace companies took part in the event, signing contracts and memorandums worth a staggering 394 billion rubles (roughly $6.6 billion). Potential business deals exceeded 600 billion rubles (over $10 billion), <a href="https://www.aviasalon.com/ru/news/item/news_id-476.htm" target="_blank" rel="noopener noreferrer">according </a>to an official statement issued following the event’s conclusion.</p>




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