Cannot Install Add-Ons or Themes Topic is solved

[gmusgrave]

I just installed Pale Moon V27.5.1 64-bit to move away from FireFox, before V57 comes out.

I installed my first add-on, Tab Mix Plus 0.5.0.4, with no problems.

However, I cannot install any more add-ons, or even a theme. If I try, I get an error that says

This add-on could not be downloaded because its origin could not be verified

This has happened for the following add-ons: Adblock Latitude and Pale Moon Commander, as well as the MicroMoon theme.

I did some research, and separately and together changed both services.sync.prefs.sync.xpinstall.whitelist.required and xpinstall.whitelist.required from the default TRUE to FALSE. This made no difference. In Tools=>Options=>Security I unchecked

Warn me when sites try to install add-ons

and, later, changed the Add-on security level to:

Off: No add-ons will be blocked (dangerous)

Neither of these changes made any difference.

I really had hopes for this as a FireFox alternative, but it is useless if I can't install add-ons from the Pale Moon repository! Odd though, that I was able to install one.

And, before you ask, I am trying to install them from the official page by left-clicking on the big green Install button.

Any help would be greatly appreciated.

thanks.

[Moonchild]

This happens when you paste a direct link to the XPI in the address bar (or open the XPI link in a new tab with e.g. Ctrl+click). This is a security measure to prevent installation of malware extensions through hijacked links. You should either install with a direct click, or save the XPI to your computer first and then install it from there.

Potentially this might also be caused by Tab Mix Plus if it is set to open links in new tabs at all times.

[gmusgrave]

[SOLVED] I did have Tab Mix Plus set to open all links in a new tab. I disabled this, and I can now install add-ons and themes. Thanks for this! That explains why I could download Tab Mix Plus, and then nothing else!

BTW, how do you install an add-on or theme manually?

[LAR Grizzly]

BTW, how do you install an add-on or theme manually?

Right click the download link and save the .xpi file to your HDD. Open the Add-ons Manager and click on the "gear" icon at the top right. Choose "Install Add-on from File" and point it to the .xpi file you saved.

[doofy]

Or drag the .xpi file onto your "extensions" window.

[gmusgrave]

Thanks all, that's a big help!

[LAR Grizzly]

Thanks all, that's a big help!

You're welcome. Saving the .xpi files saves time if you ever have to re-install PM from scratch. You don't have to go to all the websites for the add-ons, just install them from your HDD.

[guycitron]

Can't right click to download XPI files from Mozilla addon site due to "requiring newer version of firefox". Can't directly paste file url into url bar due to previously mentioned malware protection (despite completely disabling protection in options?). Next idea is to download from other websites like CNET but I'm extremely hesitant to do so. Any suggestions?

[fillerup]

Can't right click to download XPI files from Mozilla addon site due to "requiring newer version of firefox". Can't directly paste file url into url bar due to previously mentioned malware protection (despite completely disabling protection in options?). Next idea is to download from other websites like CNET but I'm extremely hesitant to do so. Any suggestions?

this addon allows you to directly download addons from AMO that are incompatible with PM: https://addons.palemoon.org/addon/moon-tester-tool/