First, open up the Mozilla Firefox application. Then, in the top left corner, there is a button that says "Tools". Click on that and a list will drop down of all the tools.
just go to the tools option of your firefox....... then uninstall it .............................................
Go to Tools > Options > Content > Fonts & Colors
go to tools and click downloads
Try this AddOn: https://addons.mozilla.org/de/firefox/addon/6543 Then go to Tools -> Add-ons -> Nightly Tester Tools, and click on settings...
go to tools all the way down and there you go
Go to Tools> options> (in Firefox), and click on restore to default.If your browser is not the Firefox, rephrase question mentioning your browser.
Go to the Tools tab in Firefox. Click on Options. Check Java and add plugins.
Go to Tools > Options > Content > Languages > "Choose your preferred language for displaying pages" Firefox is also available for download in more than 45 languages. Go to mozilla.com and select "Other Systems and Languages" under the Firefox download button.
Online default configuration is not very relevant a question. If you want to set Firefox as your default browser then go the top menu in Firefox. click tools ->options ->advanced ->general Tab ->Always Check to see if firefox is default browser ( tick this option)
Go to tools, click clear recent history, choose the period when the sites was visited and click OK. You're almost done, restart firefox.
Is this your Firefox extension? If so, you can go to Tools->Add Ons, then find the greasomonkey extension and click the Uninstall button.
Launch Firefox in android smartphone and tap on Menu (located on top right of the screen with three dots). Tap on Tools to get tools menu.