Running Linux Fedora 20, and I've just done a major software upgrade pulling in over 300 new packages, but now I have a problem in the boinc manager, even though boinc was not upgraded.

If I click on any of the buttons down the left hand side of the screen like "Project Home Page", or "Account Summary", or "Report Problems", a new copy of Mozilla Firefox starts up and takes me to the Google Home page.

What used to happen was a new tab would open up in an existing copy of Firefox and I would go the the right place.

Boinc Manager is version 7.2.42. Firefox is version 36.0.

Anyone got any ideas what is going on ?

The default web site that opens when you open Firefox is something that you set up in Firefox itself. So make sure that this is set to about:blank (Firefox->Options->Options->General).

BOINC does not change anything in the behaviour of the web browser. It merely uses the default browser to open pages, but if that default browser then says to open always on Google, it'll open always on Google.

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Yes, OK. But if I click on ANY of the buttons grouped on the left hand side of the Manager grouped under "Project Web Pages" I just get the Google home page, and not the page telling me server status or my account details or whatever button I happen to click in the manager.

Which can still be caused by Firefox.
I've had it happen to me that any link I opened in a new tab would open the search engine, because the browser would first open the link and try to load the page, but then it instructed itself to open the default page, which was the search engine.

BOINC only follows what the browser does, it does not change anything in the browser's setup or tells the browser to go open up strange things. Unless the affected project changed all its links to one of Google, but you'd be able to check that in the account_*.xml file. Otherwise, you said yourself that you didn't update BOINC, so I don't see how this would be a BOINC problem.

What you can do:
1. Check is that the browser is set as default browser (both in the browser and in Linux).
2. Check that the project's URLs didn't change. If they did, tell the project about this.
3. Make sure the browser opens up with an empty page.

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Hmm. Still could not make it work.

Removed Mozilla Firefox v36, and downgraded to Firefox V25, and it's all working OK again.

FWIW I've found FF 36.0.1 very buggy - It randomly loses some settings, and when I click on one of the buttons in BOINC I do go to the right page (sort of) but it doesn't render properly and I get half of the BOINC Manager window apparently as part of the web page. V36 also seems to have the old plugin container bug back again, as well as the really old memory leak that was fixed ages ago. They messed this version up :(