Mediawiki : Gadgets tab not appearing in appearance - mediawiki

I am trying to use the navigation popup in mediawiki but my mediawiki under appearance tab has no gadgets option and gadget definition is empty.
Special:version shows the following – (bac29ae) 06:39, 5 May 2018. It seems the gadget extension is installed but no gadget tab appears.

In addition to the Gadgets extension, you also need to define each gadget separately as described in the Gadgets extensions documentation.

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Chrome Extension or Gmail Contextual Gadget?

I've been looking into adding an "extension" for gmail, this is for an application at work, basically we want to somehow integrate some options (buttons), somewhere contextual to the email that's being viewed currently.
Our users, will then be able to install extension, and the extension will establish the authorisation aspect (not sure how this is done yet) with our application.
I've so far looked into two options, not sure if I'm on the right track:
Chrome extension, that then uses gmail.js (some third party library on github), and use some jquery to search the DOM to insert a button into the reply/delete toolbar.
I understand that this would be more straight forward but would have issues with it breaking if page layout changes, or class names changes. And would also require uses to be using chrome (which is something we are fine about)
Create a gmail contextual gadget add-on, that sits at the bottom of the email, although, I'm not sure if this contextual gadget will appear at the end of the main thread of an email or inside each individual email and will require expanding?
Also correct me if I'm wrong, but are gmail contextual gadgets limited to users with Google Apps subscription in their company? I.e. we have to subscribe to google apps in our domain and deploy it on the google apps marketplace, and similarly also have the users who want to install this gadget to also be using google apps?
Thank for everyones help in advance.

Google Docs viewer disable download

Please take a look at this link
http://jsfiddle.net/C7Py6/3/
The last icon on google viewer's toolbar - enables user to view on new browser window and download PDF. The question is, how can I make it view only and disable download (At least disable this toolbar item). Is that possible with google viewer? or is there any other viewer that works like Google Viewer but view-only?
You can host your PDF files on Google Docs and prevent viewer downloads. To do this do followings:
Once you login into your Google Docs account at docs.google.com website, you should see listing of documents in your account. Right click specific document that you want to secure by disabling download option.
Then click on “prevent viewers from downloading” option. This will remove downloading option and other users viewing the document cannot download the document file as a whole and reproduce its copy.
Also note, since you can only prevent downloading of documents created by you, click ‘Owned by Me’ option on left side. This will display document created and owned by you. Then you can disable and prevent document downloading option for files on display.
Then you can just share this PDF on your website. IT will be view only. The code will look like that:
<iframe src="url to pdf/preview" width="640" height="480"></iframe>
This is a simple way to control all features of Google Apps http://www.saasid.com/what-we-do/saasid-for-google-apps/
Application feature control gives organisations full management of application features and functions with no complex changes to theapplication back-end. Tabs, menu options, buttons and links can be can be disabled or removed from view, or their use can simply be monitored and logged. Application feature control features for Google Apps include:
Gmail can be made corporate-only,
File attach to Gmail messages can be removed,
Chat boxes removed,
Sharing options removed from menu or document editor in Google Drive
This technique will still allow the user to "make a copy" and with ownership this brings they can then download as they please. Not tested this, but I'm pretty sure I'm right...

Chrome extension that adds icon to omnibox

I've done a lot of googling and have come up dry on this. I feel like I've seen it before but I can't find any extension in my arsenal that allows this.
What I would like to do is have a chrome extension that can place an icon (or text, even better) at the right side of the omnibox in chrome.
Does anyone know if this is even possible?
What you're looking for is called a Page Action.
In which application should we use Page Actions? If you want to add your extension's features to a few specific pages, use Page Actions. Otherwise, if you want to add features in most pages, use Browser Actions instead. Text cannot be added in Page Actions, though it can be added in Browser Actions with limitation by using Badge (a bit of text that is layered over the icon).
Some good examples of this kind of extensions to help you picture the concept:
Google's RSS Subscription Extension. This extension only injects if it finds RSS feeds on a page
Lyrics for Google Chrome. This extension only injects its scripts in YouTube pages, create a new div next to the video to display the lyrics of a music vid.

adding google mini search box to mediawiki

I have mediawiki 1.16 and a google mini search engine that indexes my WIki. How can I add the google search box just below the Mediawiki search box that will allow my users to used the google mini search
Thanks
I'm using this extension http://www.mediawiki.org/wiki/Extension:RawMsg for adding any html on any page.
http://www.google.com/cse/ to make search for your own site.

Creating a Badge-less Google Chrome Extension

According to the docs I have made an Google Chrome Extension that I would describe as a "browser action" because it is present on all pages. However, my extension doesn't require any interaction so having a badge next to the omnibox is pretty wasteful. I have installed extensions that do not appear anywhere (except maybe in the context menu). How is that done and is that best practice?
Having page action or browser action icons is totally optional if you don't have any popup attached to them, so just remove the whole browser_action section from your manifest file.