I am a skeptical person and prefer to be safe instead of take a risk, including the matter of browser extensions.
Have to chose what you are really need, very useful and developed by trusted third party.
Is it safe? Well,
According to research due to be presented at the IEEE Symposium on Security and Privacy, the answer is not very. The Google-funded study found tens of millions of Chrome users have some variety of add-on based malware installed, which represents 5% of total Google traffic. http://www.makeuseof.com/tag/secure-chrome-web-store-anyway/, but as long as you can take a risk and know what you're doing, go ahead.
Right. Better safe than sorry.
If you want to track Bitcoin or ANY other cryptocurrency WITHOUT installing any third-party software or extensions try our web app called
Alarmcoin. It is super useful and totally universal!