Yahoo hijack about:config keyword- I'm stuck

I caught some malware yesterday (Spigot definitely one of them) which causes hotlinks on some pages in Firefox to redirect to Yahoo search results pages. After running Adwcleaner, it looked like Spigot and a number of other things were removed.

The Yahoo problem remains however. I cleared cookies, and also went to about:config from the address field. There, entered keyword and reset "keyword URL" (in bold).

The Yahoo problem remains still.

about:config currently has these Yahoo lines:

browser.contentHandlers.types.0.title;My Yahoo!

browser.contentHandlers.types.0.uri;http://add.my.yahoo.com/rss?url=%s

browser.search.order.2;Yahoo

browser.search.param.yahoo-fr;moz35

browser.search.param.yahoo-fr-cjkt;moz35

browser.search.param.yahoo-fr-ja;mozff

THIS ONE IN BOLD
extensions.wrc.SearchRules.yahoo.com.style;.WRCN {display:none} .sm-hd .WRCN, .sm-links .WRCN, .res h3 > .WRCN {display:inline !important; background: url("IMAGE") right no-repeat}

THIS ONE IN BOLD
extensions.wrc.SearchRules.yahoo.com.url;^http(s)?\:\/\/((.)+\.)?search\.yahoo\.com\/(.)*

gecko.handlerService.schemes.mailto.0.name;Yahoo! Mail

gecko.handlerService.schemes.mailto.0.uriTemplate;https://compose.mail.yahoo.com/?To=%s

THIS ONE IN BOLD
startpage.ntsearch_url;http://search.yahoo.com/search?fr=spigot-nt-ff&ei=utf-8&ilc=12&type=888596&p={searchTerms}


The keyword entry now shows these lines:

THIS ONE IN BOLD
avg.install.disableKeywordSearch;false

THIS ONE IN BOLD
browser.keywordURLPromptDeclined;1

keyword.enabled;true


Any advice on how to go from here to get rid of Yahoo? I don't know what to do with the Yahoo results in about:config. The context menu does not have 'delete' when right-clicking on any of them. Modify, toggle etc. a few others..

edit: nothing suspicious in Firefox Addons Extensions, btw.

ThrashZone said:

Safe mode with networking,
Shut down your machine, Unplug-Hold the power button down for 30/45 seconds (Power Drain)
If on a laptop remove the battery then use power drain,
Power up and Tap the F8 key continuously until you see a black page with white text,
Use the down arrow key to toggle to safe mode with networking/ hit the enter key.
Login as usual
Other advanced methods,
https://www.sevenforums.com/tutorials/69585-safe-mode.html

Don't have time to try this until tomorrow. What will this procedure do?

ThrashZone said:

Hi,
It will allow you to download Adwcleaner and post the scan result Here as a text attachment,
Also your other text file,
Then repeat Adwcleaner booting normally and post that scan log as a text attachment,
Cheers.
http://malwaretips.com/blogs/remove-adware-popup-ads/

I've decided to reformat with new Win installation. The old laptop is full of stuff I don't need anyway. Thanks for your help.