Slow Firefox startup because of prefs.js
My Firefox startup time became very slow all of a sudden. It went from 1-2 seconds to 8-10 from one day to the next. After troubleshooting I managed to find the culprit - it was something in my prefs.js file. Is someone willing to analyse this file to see what was causing the problem? I can upload it to a hosting service, but I would like to make sure it does not contain any personal or compromising data. For now I just deleted the file and lost some of my settings in the process, but it was the only way to fix the problem that I could find.
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Hi Simplex, I am sure that there are some community members that could look at it, however you may also have good luck in stackoverflow if we cannot help.
Let's give it a shot. Pastebin.mozilla.org is what I use if you do not have a particular share in mind.
Here is a link to the pastebin: https://pastebin.mozilla.org/8838172
The last preference is not complete. Unless not all of it was copied.
- "user_pref("extensions.sdk-widget-inserted.widget:jid1-4P0kohSJxU1qGg@jetpack-browserAction1", true);
user_pref("extensions.sdk-widget-inserted.widget:jid1-4P0kohSJxU1qGg@jetpack-"
Looks like pastebin at mozilla cut off over half of the contents of the file without informing me about it - the original file has 1200 lines. I tried repasting and same thing happened - only around 500 lines were saved, so I guess pastebin.mozilla.org is a poor place to paste anything longer than 500 lines.
So I posted it to a proper site which does not stealthily cut off content: http://pastebin.com/C8HNBcci
I hope this helps.
We are still working on taking a look at what might becausing the issue. However there was some tips I got from Noah in the sumo channel that might help some individual troubleshooting. Start by opening a new profile and eliminating all of the preferences in the file that have to do with add ons. (similar to how we troubleshoot in safe mode to see if its an issue with addons)
Do you see a difference? If so, add each back one at a time to the file, including the add on preferences lines.
I would take the same method with other preferences. (tedious, but a good start)
Hey Simplex, I'm curious to solve this mystery as well. Hopefully tracking down these bad prefs can help us fix other users slow startups. :)
I created 2 reduced versions of your prefs.js file: http://pastebin.com/zs5m6KPe - prefs-trimmed.js http://pastebin.com/at0Ugvfj - prefs.weirdnessremoved.js
The first file I bet will still have the problem. The 2nd I cleaned of 3 weird prefs that looked malicious but I'm not sure if they are yet. I think the 2nd file will work better. If not, I can reduce it some more.
Now remember to backup your current prefs.js file to another location just to be safe. Firefox must also be closed before you can switch out the prefs.js file.
I tested both files and both have startup time over 7 seconds.