Dims facebook's mobile page, blocks ads, filters posts with keywords for you, and makes images click-to-fullsize.

m.fb.Dim.user.js

// ==UserScript==
// @name         m.fb.Dim
// @namespace    Sketch2
// @description  mobile.facebook.Dimmer
// @include      https://m.facebook.*
// @exclude      https://m.facebook.com/friends/*
// @version      1.8
// @grant        GM_info
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_xmlhttpRequest
// @grant        GM_registerMenuCommand
// @updateURL    https://git.io/vX0QU
// @require      https://code.jquery.com/jquery-3.1.1.slim.min.js
// @license      GNU GPLv3 - https://www.gnu.org/licenses/gpl-3.0.html
// ==/UserScript==

//-------------------
//  keywords to block.
//  lowercase or uppercase; no preference.  Script will check both for you.
var BLOCKLIST = ['vote', 'Trump', 'Hillary', 'Clinton',
                 'elect', 'republican', 'democrat'];


//---------------------------------------
//  surround your keywords with 'quotes'
//  separated by a comma,
//  be sure the entire list is surrounded with [brackets]
//  then finish with a semicolon;


//---------------------------------------
//  this next list is keywords to ignore.
//  I discovered the word 'electronics' contains the word 'elect'
//  and so, was unexpectedly being highlighted.
//  put words here that you don't want to be accidentially tagged.
var WHITELIST = ['electron'];


//-----------------------------
//  Standard websafe hex Colors
//  #RRGGBB  (or)  #RGB

var OuterBackground, OB  =  '#013'
var InnerBackground, IB  =  '#347'
var NewsFeed, NF         =  '#111'
var NewsItem, NI         =  '#446'
var Fields               =  '#335'
var Highlight, HL        =  '#500'

var Font1  =  '#975'
var Font2  =  '#570'
var Font3  =  '#000'

//----------------------------------
//font size that the blocklist uses.
var FontSize = '10px'

//=================================================================
//  Don't edit below this line, unless you know jQuery / Javascript


//dim outer background
$('body') .css('background', OB);

//dim inner background
$('div#root') .css('background', IB);
$('div#root div') .css('background', IB);
$('div#root div div') .css('background', IB);

$('div#root div div div') .css('background', "linear-gradient(to right, " + NI + ", " + Fields + ")") .find('div') .css('background', NI);

//dim news stream
$('div#m_newsfeed_stream div') .css('background', NF);
$('div#m_newsfeed_stream div div') .css('background', NI);

//input
$('div#mbasic_inline_feed_composer') .css('background', IB);
$('div#mbasic_inline_feed_composer') .parent() .css('background', IB);
//buttons
$('div#mbasic_inline_feed_composer div') .css('background', OB);
//fade background
$('div#mbasic_inline_feed_composer') .children('form') .children('div') .css('background', "linear-gradient(to right, " + OB + ", " + IB + ")");

//text
$('a') .css('color', Font1);
$('h3') .css('color', Font2);
$('h3') .next('div') .css('color', Font3);
$('p') .css('background', NewsItem);

$('a:contains(See All Notifications)') .css('background', "linear-gradient(to right," + OB + ", " + IB + ")");

$('a:contains(Show more)') .css('font-size','22px');

//hide random people
$('h3:contains(People You May Know)') .parent() .hide();
$('a:contains(See All Friend Requests)') .parent().parent().parent().parent() .hide();

//hide birthdays
$('a:contains(birthday)') .parent().parent().parent().parent() .hide();

//hide SMS notice
$('span:contains(Receive your notifications via SMS)') .parent() .hide();

//clear background of video buttons
$('span:contains(Play Video)') .parent() .css('background','');

//clear background of links
$('a') .children() .css('background', '');

//wider is better
$('div#viewport') .css('max-width','70%');

//languages
$('div#viewport') .children('div:last') .not('div#objects_container') .children('div:first') .remove();

//next page- bigger text
$('div#root') .children('div:first') .not('div#m_story_permalink_view') .children('div:last') .css('font-size','20px');
$('a:contains(Next)') .css('font-size','26px')

//bigger pic  +  no tag or report buttons to get in the way
$('a:contains(View Full Size)') .css('font-size','18px') .siblings() .remove();

//make images clickable, to view full size
$('a:contains(View Full Size)') .each(function(){
  $('div#root div:first div:first div:first div:first div:first img') .wrap('<a></a>') .parent() .attr('href', $(this) .attr('href'));
});

//add a text container
$('a:contains(View Full Size)') .after('<span class="imageText"></span>');

//add image tags to the text container
$('span.imageText') .html($('a:contains(View Full Size)') .parentsUntil('div#root') .find('img') .attr('alt')) 
  .css('padding', '0px 40px') .css('font-size','12px');

//see more photos
$('div#m_more_item') .css('font-size','22px');

//hide ads
$('span:contains(Sponsored)') .parent().parent().parent() .hide();

//fields
$('div#root a') .children('div') .attr('class','') .css('background', "linear-gradient(to right, " + Fields + ", " + NI + ")");

//block keywords
for (var i = 0; i < BLOCKLIST .length; i++) {
  //all lowercase letters to begin with
  var Lower = BLOCKLIST[i] .toLowerCase();
  var LoW  = WHITELIST[i] .toLowerCase();

  //convert first letter to uppercase
  var Upper = Lower .substr(0,1) .toUpperCase() + Lower .substr(1);
  var UpW = LoW .substr(0,1) .toUpperCase() + LoW .substr(1);

  //try both lower, and uppercase, permutations.
  $('h3:contains(' + Lower + ')') .add('span:contains(' + Lower + ')')  //lowercase versions
    .add('h3:contains(' + Upper + ')') .add('span:contains(' + Upper + ')')  //uppercase
    .not(':contains(' + LoW + ')') .not(':contains(' + UpW + ')')  //excluding words from whitelist
    .css('font-size', FontSize) .parent().parent()  //shrink text a bit, then select outer container
    .css('background', "linear-gradient(to right, " + HL + ", " + NI + ")");  //so we can highlight it.
  //you could  .remove()  the whole block here, if you really felt like it.
};

$('div') .css('font-size','');

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Firefox users need
Chrome users need

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Once you have one of those, press the 'Raw' button on the top-right corner of the script.

(normally that would show you the raw text, but GreaseMonkey and
TamperMonkey recognize the text as a script, so they ask if you want to install it.)