Chromium browsers as an alternative to Firefox (Opera,..)

Personally, I prefer FF and its amazing XUL add-ins but...

Sometimes it is necessary to use something different

For official Chrome.
1 Disable the crap
     Windows,  Administrative tools, Task scheduler, Updates
(it is scaring to see big companies relying in this services)


For Opera. (a cleaner chrome)
0-Download your prefer version
    ftp://ftp.opera.com/pub/
1- Import Bookmarks
    Settings, Browser, Default browser
2- Add dictionaries
    Settings, Browser, Languages
3- disable updates (add as parameter to a batch file)
    --disable-update
    (verify in about)
4- Install extension
     Download Chrome Extension
5- advanced config/experiments (a kind of about:config)
    opera://flags


To use Java with Opera, v30 is the last Opera supporting (PPAPI) Pepper Plugin API, the flavor of NPAPI (Netscape Plugin API)
Theoretically v36 recognize NPAPI plugins but they don't work :(

Extensions

Grab the .nex file and rename it to end in .crx.
Install the best extensions.
-CRX viewer (can view inside crx/nex/xpi files)
-Web Developer
-Violentmonkey (clone of grease monkey)
-Adblock


From chrome shop (https://chrome.google.com/webstore/category/extensions)
-FoxyProxy Standard
-

For Chromium 
from Chromium open source project

Last version with PPAPI (flavor of NPAPI) (requires chrome://flags/#enable-npapi)
Chromium build 45.0.2416.0-win32

Differences Firefox/Chromium

• Developer tools, Network

in Chrome by default the log is not accumulative, so
Developer tools, Network, check "Preserve log"

• add-on extension

.xpi (renamed .zip with XUL) vs .crx(Chrome) .nex (Opera)

Web containing crx files:
https://www.crx4chrome.com

Internal information/configuration 
chrome://about (in Chromium, list of all chrome:// URLs)

chrome://net-internals/
 (proxy, export, events,...)
chrome://memory
chrome://dns
chrome://memory-redirect/
chrome://version/   (includes profilepath)
chrome://flags/    (similar to about:config)

for other Chrome forks replace chrome by: brave, edge, vivaldi....

Opera and Vivaldi redirect some chrome urls to their own ones

opera://config  (config tab)
opera://about
opera://extensions

about:dns
about:net-internals