Revert to Google's 2013-2015 Favicon (image below)
Google's Sept 1, 2015 Favicon Fiasco (ugly, and annoyingly visible new favicon design) inspired this Greasemonkey userscript for the Firefox web browser. It may also work as a Tampermonkey userscript for other browsers - Google Chrome, Opera Next, Safari, Dolphin Browser or UC Browser - but that was not tested. I have thoroughly tested this userscript in Firefox - it works perfectly, and it gets automatic updates from Greasy Fork, also. (If anyone tests this as a Tampermonkey userscript, I'd appreciate a message informing me of results - I don't use any of the listed browsers). This userscript can be installed in Firefox with 1-click (the green "Install This Script" button at the top of this page) - IF the Firefox userscript manager add-on "Greasemonkey" is first installed. If you don't yet have Greasemonkey or Tampermonkey, they, too, are easy installs...
https://addons.mozilla.org/en-us/firefox/addon/greasemonkey/ (1-click install)
https://tampermonkey.net/ (select tab at top for desired browser - Chrome, Opera Next, Safari, Dolphin Browser or UC Browser)
On about Sept 1, 2015, Google changed their Favicon. A previous Greasemonkey userscript was released ("Revert Google's Favicon 1.0") by "Anonymous", who even promoted it in a YouTube video (before he closed his YouTube account and the video was deleted). But it had errors in the "include" URLs - it did NOT work on URLs such as "books.google.com".
Additionally, a Stylish userstyle was released ("Google Search Icon Restorer"), but it also had an error - it did NOT replace the ugly new Google favicon in the Address Bar - but it did on Browser Tabs (I was upset enough about the Address Bar favicon problem, I didn't even take the time to find out if it reverted Bookmark favicons). I gave the style a negative review on UserStyles.org because of the Address Bar favicon non-reversion. I was so inpatient for a fix that I didn't want to wait for the user style's author to address my private message to him about it, and perhaps fix it. His work was otherwise very good, and he brilliantly gives the user of a choice of five Google favicons from which to choose (going all the way back to 1999) - although the choice must be made prior to installation, and is locked-in - another comment I made in my review. And his animated GIF showing the 5 histoical Google favicons is good work, showing the historical progression of 5 Google favicons over the last 16 years. It inspired me to create a modified version of it. My GIF (modified from the one on the "Google Search Icon Restorer" author's UserStyles.org page), adds the years each of 5 Google favicons was used, and a main caption (both in red text), plus the "Historical Animation" caption at the top (animation below - click to enlarge) I also eliminated the inter-logo fades and shortened the logo dwell time to 3 seconds each. (NOTE: You might want to check out his style (link below), especially if you turn "Off" display of Address Bar website favicons - via the Firefox Add-On "Classic Theme Restorer" - which would immunize yourself from any Address Bar favicon distraction. "Classic Theme Restorer" also allows reverting all Firefox "Australis" theme changes that started with FF29).
https://userstyles.org/styles/118366/google-search-icon-restorer
https://addons.mozilla.org/en-us/firefox/addon/classicthemerestorer/
The userscript on this page corrects the shortcomings - in both previous Greasemonkey userscript and Stylish userstyle. This Greasemonkey userscript has been thoroughly tested, and works for all Google domains tried (due to the globally generic "include" domains) - AND for all Google favicon locations (see NOTES below).
----- Enjoy! -----By the way, the Greasemonkey userscript and Stylish userstyle referred to above (that had shortcomings) were both released Sept 2, 2015 - only about one day after Google's VERY ugly new favicon was introduced...
I'm not the only person who hates the "new, but not improved" Google graphics - or was immediately inspired to get rid of it.
Google also changed their main logo on their homepage - to a very childish monstrosity (there are numerous negative online comments about the logo change, also). For over a year, I've used the Stylish userstyle "Black Google by Panos", which beautifies Google's homepage with a shaded, shadowed, and slightly mirrored multi-color Google logo on a black background. Using it immunizes me from the Google homepage logo change. (Other Stylish userstyles already exist to simply revert Google's logo to the old one, on the white background). But the Google favicon uglification was TOO MUCH! Therefore, after failing to find a cure with either existing mods (Greasemonkey or Stylish) for the Google favicon fiasco, I developed my own fix, only 4 days after their new favicon introduction - that's how incensed I was!
I've posted an screenshot below of Google's homepage (center detail), when the Stylish userstyle "Black Google by Panos" is enabled
(click to enlarge).
The NOTES section below has a blurb on Stylish, with download links for it and Panos' userstyle.
NOTES:
• Once this userscript is installed - or "enabled" AFTER being "disabled" - already-open Google webpages need to be Refreshed (F5), and all pre-existing Google bookmarks that picked up the newer Google favicon have to be revisited, to complete the favicon reversion.
• ALL Google favicon locations - the "URL Bar/Address Bar/Location Bar", "Web Browser Tabs", "Bookmark Menu" and "Bookmark Toolbar" - will be reverted to the Google favicon used before the Sept 2015 change - to the...
white lower-case "g" in a blue square (image below).
• This userscript's "include" URLs have "*" before and after ".google.", so the script works globally on Google sites, i.e. with "books.google.com", "www.google.com", "myaccount.google.com", "google.co.uk", "google.de", etc (*anything.google.*anything) - including, of course, both http:// and https:// Google domain protocols.
The UserScript metadata block in the code needs only 2 "include" lines - use of both asterisks on each line makes the script "globally generic Google", and should cover everthing Google...
("http://*.google.*" and "https://*.google.*").
• If you're a fan of Google "doodles" and other special, topical logos - they also get replaced on the homepage if the "Black Google by Panos" userstyle is enabled, but if you click the Stylish logo (that by default gets placed at the lower left of the browser window in the Add On Bar/Status Bar), then toggle Panos' style "Off", you immediately see the homepage unmodified.
• Stylish (userstyle manager) is to CSS as Greasemonkey (userscript manager) is to JavaScript. (The Stylish add-on is a pre-requisite to installation of usestyles for Stylish). Greasemonkey uses JavaScript userscripts to modify target webpages, while Stylish uses CSS (Cascading Style Sheets) userstyles to modify target webpages. All users should consider using BOTH userscripts and userstyles to modify their favorite webpages - many thousands of free userscripts and userstyles are available to do just that.
https://addons.mozilla.org/en-us/firefox/addon/stylish/ ("Stylish" userstyle manager, 1-click install)
https://userstyles.org/styles/61377/black-google-by-panos ("Black Google by Panos" Google homepage dark theme, 1-click install...
screenshot below)
This userscript's installed filename:
Revert_to_Googles_2013-2015_Favicon.user.js