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I cannot change my firefox theme

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New Contributor

I cannot change my firefox theme

I seem to be stuck on a certain background theme/persona. Whenever I go to change themes, nothing changes. I can switch back to the original default theme but other than that, I'm stuck with a snowflake theme I used during winter. I've disabled all my extensions through safe mode to no avail. I've cleared cache and cookies, updated plugins, searched for the stuck theme in about:config and in my firefox folders, etc. So far, nothing has worked... Any ideas?!

1 ACCEPTED SOLUTION

Accepted Solutions
New Contributor

Re: I cannot change my firefox theme

Alright, it's sorted! I had a lwtheme folder where theme-header and-footer were stored, but for whatever reason I needed to have the theme-header and -footer files outside of the folder too. I didn't have them! So, I transferred them over from the new profile I created to my old profile and presto! Then the preview wasn't working but I found this and solved that problem too - http://www.hazelstutorials.com/firefox-personas-mouseoverhover-not-working/#comment-8779 Thanks again everyone!

23 REPLIES
Site Moderator

Re: I cannot change my firefox theme

hello, have you set firefox to never a remember history (a.k.a. always run in private browsing mode) in firefox/tools > options > privacy. in this case it's a known issue that light-weight themes won't work in this mode currently. this bug will be corrected in the upcoming firefox release.

New Contributor

Re: I cannot change my firefox theme

I forgot to mention that I checked that already. I have "Remember my browsing and download history", "Remember search and form history" and "accept cookies from sites" all checked. Thanks for the idea though. Any others?

Site Moderator

Re: I cannot change my firefox theme

You can check for problems with preferences and rename or delete the prefs.js file and possible numbered prefs-##.js files and a possible user.js file to reset all prefs to the default values.

All Star Contributor

Re: I cannot change my firefox theme

What about full-fledged themes? I heard that those are turned off for private browsing windows. Since I dislike the default theme, that would make me reluctant to bother with private browsing.

New Contributor

Re: I cannot change my firefox theme

The prefs.js doesn't seem to be locked, corrupt or damaged in any way and I would prefer not to reset it because I have a lot of settings established. All other preferences are saving just fine. And I can switch back to default and that saves. I really don't want to reset because, unless I am misunderstanding something, I'm going to lose all my settings and it would take a long time to redo things. I even searched the prefs.js for the stuck theme - nothing!

Site Moderator

Re: I cannot change my firefox theme

The list of installed Personas is stored in prefs.js in the Firefox Profile Folder and can be inspected on about:config in the lightweightThemes.usedThemes pref in JSON object format ({"id":"#","name":"xxx",...}).

The first entry of that pref is the currently used persona.

You can check for problems with the lightweightThemes.* prefs if you aren't able to change the Persona.

If it works in Safe Mode and in normal mode with all extensions (Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.

Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: "Firefox > Quit Firefox"; Linux: "Firefox/File > Quit")

New Contributor

Re: I cannot change my firefox theme

Thanks for the help, however my themes do not work work in safe mode (I said that above, but perhaps not very clearly.) And I can see the persona I am suppose to be using in my prefs however, that is not what is currently showing, which is the problem. The snowflake theme is what is showing no matter what I switch to. The only theme that will work is that and the default. Any other installed theme automatically displays the snowflake theme. I have uninstalled the snowflake theme and have tried reinstalling alternative themes but every time I get snowflakes.

Site Moderator

Re: I cannot change my firefox theme

Try to remove the lightweighttheme-header and lightweighttheme-footer files in the Firefox Profile Folder.

New Contributor

Re: I cannot change my firefox theme

I don't have specific files in the Firefox Profile Folder for the theme-header and -footer. I do have them listed in the prefs.js file. Do you mean I should remove them from the prefs file or is there somewhere else I should be looking? Thanks again