I know there are lots of questions about installation of IBM Notes Browser Plug-in. Following article will clear up all the questions:
Installation
The Notes Browser Plug-in can be installed in below two different ways:
Notes Browser Plug-in with Notes Standard client:
If you want to be able to run the Standard Client and Notes Browser Plug-in on the same system at various points, you should select this so you can install both the clients on the same system. Please note that you cannot run both the client at the same time. You must exit one to start another.
Steps to install Notes Browser Plug-in with Notes Standard Client:
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In the Standard Client installation user Interface, once you specify the directories for Program Files, and Data Files, you get to the below screen.
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In this screen, if you expand the "Notes Client" feature, you will see an option to install "Notes Browser Plug-in". By default, this option is disabled. If you wish to install the Notes Browser Plug-in, please "uncheck" this option.

3. Once the installation of Standard Client is complete, it will also register the plug-ins for Firefox and Internet Explorer.
Notes Browser Plug-in stand-alone
Use this if you want to only have IBM Notes Browser Plug-in on your system, and plan to use iNotes for mail.
There are two variants of the stand-alone Notes Browser Plug-in installation: NotesPluginMax and NotesPluginMin. These will always install a multi-user version of the Notes Browser Plug-in.
NotesPluginMin – does not contain attachment viewers, JVM, or spell check.
NotesPluginMax - JVM is required if you have any application which has a Java Agent in it.
Both of these packages are packed into "setup.exe", so you simply need to run "setup.exe" and accept the License agreement. The remainder of the installation is done in the default path as follows:
Program Directory: C:\Program Files(x86)\IBM\Notes
Data Directory: C:\users\USER_NAME\AppData\Local\IBM\Notes\Data
Both of these installations support "Silent Install" and all of its options.
By default, this will be a multiuser installation. Since the new installers do multi-user installations, and due to the change in the Install & Data directories, your old data may not get migrated. After the installation is complete, and before launching the client, please copy any of your existing saved data (bookmarks, names.nsf, etc.) into the new Data directory.
Once the installation is complete, the first time you bring up the browser (IE or Firefox), it will ask you about a "new Plug-in" which has been installed, and whether to enable it. Please make sure that the answer to this is "Yes".
Configuration
Once the installation is done, it will create a desktop icon "IBM Notes Browser Plug-in". Double-click the icon to launch the Notes Browser Plug-in. For the first launch, you have to go through the configuration wizard.
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Welcome Page. Hit Next

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User Information - Enter your name, Domino server. Hit Next

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Notes ID File - Specify the path to your Notes .id file. Hit Next

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Select “Yes” if you want to copy the id file to data directory in next prompt

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Enter password for user in password prompt and hit “Log In” button

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You can see the starting home page for user opened up in browser. From here you can access user's iNotes, Workspace, database and documents
-- Raj