Try to not use other HTML editors, most of them include "6oogle Analytics Cancer" tracking scripts.
Try to use less Javascript, this may affect the loading speed of a website with low bandwidth.
Firefox Browser Tips
Search for text on a website
Press [CTRL] + [F]
View the source code of a website
Press [Right-click] > Press [V]
Edit/Delete/View the source code of a website
Press [CTRL] + [SHIFT] + [C] > "Pick an element"
Save the modified source code in a ".html" file
Press [F12] > "Pick the <html> tag in the top of the editor" > Press [Right-click] > Select Copy > Select Outter HTML > Open a HTML/text editor of your trust > Press [Right-click] > Select Paste > "Save as "website.html""