When i open Firefox it opens not only my homepage but also opens add-nos manager, Feeds,News&Blogging and Dow load bestvideodowloader
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It sounds like you have a Third-Party Toolbar that has taken over your Search Engine, Home Page, and/or the Default New Tab Page. Fortunately this can be remedied easily:
After Firefox restarts, install the Search Reset Tool. This will remove the rest of the traces of this program from your Firefox.
For further information, please read Remove a toolbar that has taken over your Firefox search or home page.
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Thanks a lot now is absolutely fine.