P.S. I've noticed that all the problematic plugins (most of the good ones out there!), are all preceded by the OpenSearch "A9" icon for Mozilla FF v. 2/3. The ones preceded by the Mac Apple icon, are swiftly added to the list of search engines and give no problem at all. However, these are few in number and the ones I want, are mostly OpenSearch compatible. Any way to fix this issue?
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Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
- Do not click the Reset button on the Safe mode start window or otherwise make changes.
Wow! That solved my problem. Now, how do I get it to work without going into Safe Mode? Or do I have to always switch to Safe Mode every time I want to add a search engine plugin from the Mycroft Project?
If it works in Firefox Safe-mode then disable all extensions (Tools > Add-ons > Extensions) and then try to find which is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
Same problem with Ubuntu 12.04 and Firefox 19. Solution proposed by cor-el does not work for me. Is there anything else I could try? Thank you in advance.
You can check for problems with preferences and try to 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.
Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
Thank you cor-el for your help but it turned out I had to install Firefox search engine plugins with root privilege. Then the pop-up window showed up and I could add the needed search engine. Still not sure if this is a Firefox or Ubuntu issue, let alone if this can be called an issue at all. I hope this helps someone to install Firefox search engines too!
For Ubuntu 12.10 users: Disable the Unity Desktop Integration Plugin & restart the browser. Then you can add search engines from the Firefox website.
As I'm using Gnome Shell, I haven't renabled it since. Unity users should try.