That is the maximum that is set: const DEFAULT_MAX_USED_THEMES_COUNT = 30;

• resource:///modules/LightweightThemeManager.jsm

(you can inspect that file via the location bar, just like a web page)

You can override that default by creating a new Integer pref and set the value to suit your needs.
Name: lightweightThemes.maxUsedThemes
Value: <as you like>

• http://kb.mozillazine.org/about:config

I typed about:config and I don't see lightweightThemes.maxUsedThemes in there I see lightweightThemes.UsedThemes so I don't understand how am I supposed to this also would it be pretty much the same method with Thunderbird? Here Ill leave an image.

You need to create a new Boolean pref via the right-click context menu (New > Integer) on the about:config page like I wrote above because that pref doesn't exist by default.

See the http://kb.mozillazine.org/about:config article for details.

OK I looked over your solution a little more and I think I understand now so after I go into about:config and type lightweight I right click Integer pref then type lightweightThemes.maxUsedThemes then I set the value for lets say 150 after that Ill be able to store up to a 150 personas correct?

OK I looked over your solution a little more and I think I understand now so after I go into about:config and type lightweight I right click Integer pref then type lightweightThemes.maxUsedThemes then I set the value for lets say 150 after that Ill be able to store up to a 150 personas correct?

As long as you create a new Integer pref with the correct name (paste the name to prevent errors) then it should be OK, but don't exaggerate too much with the maximum number of personas. 150 personas will take a lot of space in prefs.js, so make a backup of the file after making changes to options and personas in case problems arise.

You can use this button to go to the Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Open Containing Folder

• http://kb.mozillazine.org/Profile_backup

So would you say 75 is to large or should I set it for maybe around 50-60 and one more question about backing it up would Mozbackup be a good choice in your opinion?

Just try how it works out.

Opening the Theme manager (Tools > Add-ons > Appearance/Themes) and scrolling through 100 personas may also take time. I have never tried that much personas and I don't know if it affects the performance to have that many.

Well how many would you recommend because I want to have at least 30 more than I do now and do think I should use Mozbackup to back up my profile?

Having a backup of files in the Firefox Profile Folder is always a good idea.

• http://kb.mozillazine.org/Profile_folder_-_Firefox

Try 60 as the double of the current maximum of 30 and see how that works.
You can always bookmarks your favorite personas by clicking the star on the location bar.

Well so far so good but Ill wait at least two weeks before I make my final verdict in as for right now thanks for all the help you did me a great favor and have a fantastic week.

I just thought of something would this modification have any negative effects on future updates for example lets say FF v 13 can store up to 60 persona's would my modification mes with this and cause me to have problems?

Well two weeks have passed and there were no problems to mention so this method really works very well although when loading my Appearance's in Add-on's it take a little longer to load than it did before. One side note you shouldn't set the value in Firefox/Mozilla product much beyond 60 persona's or else you might run into problems and currently I have 51 persona's and might add a few more.

If it works for you then you shouldn't worry too much.
Be aware that you only save the data to access the personas on the Getpersonas server and not the actual images, so if a persona is redrawn by the creator or otherwise then you will lose it.

So then I should be able to increase it to 70 or 80 persona's? And in other words persona's are streamed through the cloud OK I thought that might be the case makes sense other wise wow that's allot of data for one browser to hold lol.