Analyze extensions performance impact for Firefox

[denar90]

The purpose of the project improving speed on a web. All results we were gathering related only to Chromium mostly. We’d like to extend results and see extensions (Add-ons) influence for Firefox users.

Some part of work was already done. We are able to install add-ons using [Puppeteer(https://github.com/GoogleChrome/puppeteer). Thanks for the help to extend API for web-ext repo to @aslushnikov @rpl @Rob--W.

More info can be found https://github.com/GoogleChrome/puppeteer/issues/4162 and https://github.com/GoogleChrome/puppeteer/issues/4162

Next step - use performance API which isn’t implemented yet in Firefox. Related bugtracking issues:

• https://bugzilla.mozilla.org/show_bug.cgi?id=1463069
• https://bugzilla.mozilla.org/show_bug.cgi?id=1348405

All experiments are stored separate branch - https://github.com/treosh/exthouse/tree/firefox-experimental

[denar90]

On today's Add-ons Show and Tell we discussed this topic. Folks are positive about that. Hope that Importance for the Long Tasks API for Firefox will be changed. Waiting for @digitarald opinion about that.

[denar90]

Trying to figure out (#28) possible usage of js-self-profiling API in case it will be implemented sooner.

Bugzilla ticket https://bugzilla.mozilla.org/show_bug.cgi?id=1393617