Cleaning out your Firefox profile.

For a while now, I’ve been having problems with my Firefox profile. To be fair, it’s mostly because of random about:config tweaks I’ve made, but still, not being able to test the new SocialAPI stuff was pretty annoying. So I decided to try resetting my profile, to clear out all the junk, and hopefully even make it a little faster.

But, as the page I linked to just up there mentions, resetting your profile will lose your open tabs, windows and tab groups, which kinda sucks, because I have 57 open tabs, in various groups, and I really don’t want to lose them! Fortunately, I’m a programmer, so I hacked on Firefox to get it to save and restore my tabs, and now I’m a happy camper!

A couple of days later, one of my co-workers had some similar problems, and also wanted to re-set his profile to try and fix them. I hadn’t saved the results of my hacking, so I had to re-create it for him from a combination of memory and the documentation. The new code I came up with looked something like this:

var x = gBrowser.tabs
var rv = "var tabs = [\n"
for (var i = 0; i < x.length; i++) {
  rv += '  "' + x[i].linkedBrowser.contentWindow.location + '",\n';
rv += '];\nfor (var i = 0; i < tabs.length; i++ ) {\n'
rv += '  gBrowser.addTab(tabs[i]);\n}\n'

To run it, first open about:config, and make sure the preference is set to true (double-click it if it isn’t, and it should switch automatically), then go to the Tools » Web Developer » Scratchpad menu item, which should open up a small new window with some javascript comments in it. While that window is focused, click on Environment » Browser, to make sure that you’re running the code in the browser’s chrome (instead of in the page’s content). Paste the code in, and click Execute » Display.

That should result in a bunch of code in grey surrounded by /* and */ that looks like:

var tabs = [
for (var i = 0; i < tabs.length; i++ ) {

Copy that out of the scratchpad into your favourite editor, remove the /* and */, and run the profile reset.

Once you’re done resetting your profile, you’ll need to change the preference to true again, and then re-open the Scratchpad, paste the new code you saved back in to it, click on the Execute » Run menu item, and shazam! All your tabs should be back (although they won’t be in their original tab groups. If anyone needs me to figure out how to do that, just let me know, and I’ll give it a try).