2015-08-19

[Technology] Starting Firefox Faster


summary: if you use pinned tabs, and they're all loading at start, despite setting tabs to not load until selected, this post is for you.

I have two hard disks, a 24GB SSD (fast!) and a spinner.  I noticed that to fully load Firefox and wait for everything to settle, it was taking about a minute and a half, back when my root directory was on the HDD.  Recently (see earlier posts), I moved my root onto the SSD.  That improved things marginally.  Firefox was now settling in around 1m12s.  I tried moving my profile onto the SSD.  Now I was down around 1m00s.  (These are averaged from multiple warm runs.)  That is still abysmal.



One thing I notice is that a private web app I wrote (look up My Daily in past posts maybe) is guarded by an .htaccess file, and I have it as a pinned tab.  In that full minute, before things finish settling, I get prompted to authenticate myself.  I then recalled that I had enabled the Firefox option to load tabs when clicked (Preferences > General > "Don't load tabs until selected"), so why is it loading?



All the pinned tabs actually seem to be loading at startup.  Grr.  Perhaps that is tunable?



I went to about:config, and sure enough, typing in "pinned" filtered down to this setting:


browser.sessionstore.restore_pinned_tabs_on_demand

defaulting to "false".  I set it to "true", and now Firefox takes <3s to open and settle.  Sure, clicking on a pinned tab now takes a normal time to load the tab, but it's better than loading GMail, Google Calendar, Blogger, Google Drive, Google Keep and my web app ALL AT ONCE.

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