The forum is one-person coded (theymos), so upgrade speed is low, and totally depends on theymos (his time, and his to-do list). Therefore, when possible users tend to create userscripts to simlify things and improve their own experiences in the forum.
I collected some of them (maybe I missed topics) for you. In case you know topics that are not presented here (I don't know them or forget to list them here), please feel free to leave a reply and details of missed Userscripts.

When lits of userscripts become bigger, I might categorise them, but for now I don't do it.

Date time format: Date/Month/Year

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TOPICS

Topics	Date	written by	Section	Merit
_____________________________________________________________________	________	___________	___________________________	______
Dark theme for Bitcointalk(CSS only)	22/4/2014	Cyrus	Bitcointalk.org's theme	5+
Bitcointalk Dark Theme	31/12/2017	Bitoken	Addon for Chrome/ Firefox	7+
Bitcointalk Dark Theme	05/06/2019	franckuestein	Addon for Chrome/ Firefox/ Safari	10+
Signature Adblock Script [0.5.0]	26/03/2015	grue	Signature Adblock	6+
Ignore threads - user script	26/04/2016	NLNico	Tool to get Ignore threads	1+
Bitcointalk Post Iconizer - Custom post / PM editing buttons for adding BB code	07/02/2017	mprep	Iconizer	0+
Enhanced merit UI [1.1]	27/01/2018	grue	Merit UI	171+
Improved images on the forum - Tampermonkey/Greasemonkey user script	27/02/2018	EcuaMobi	Images	1+
Bitcointalk Mobile Friendly App for Android	20/6/2018	fahbil	App for Android	8+
Bash script to filter new topics created by high rank members only	01/08/2018	spirali	New topics Filter	13+
Browser Addon That Helps You Ignore Spammy Comments	16/01/2019	CapnSparrow	Ignore Spam	21+
[Userscript] Report to moderator on post history	24/01/2019	Cyrus	Report posts	72+
[Userscript] Bitcointalk Post Filter	28/01/2019	hatshepsut93	Post Filter	6+
One-click mod report, not for the faint of heart	29/01/2019	Mutiple authors	Addon for Firefox/ Tor/ Chrome	60+
Hide my name	]06/4/2019	Muti-authors	Tools	0
The message exceeds the maximum allowed lenght (64000 characters)	20/04/2019	TryNinja	Message length	6+
Quote/Keyword/Reply/Topic Notifier	24/5/2019	edgycorner	Bot Notifications	25+
User Script: Automatically remove nested quotes	28/5/2019	EcuaMobi	Pyramid / Nested quotes	26+
[Userscript] archive-is fast link	05/06/2019	babo	Archive tools	0
print balance of address - v0.1	25/6/2019	babo	check address balance	0+
AutoReply v1.0	01/4/2019	Aero Blue	bump thread & delete old bumps	2+
Bitcointalk Extension - All In One v2.5 *	23/8/2019	mrvuit	Multiple features	7+
Sum and display total received merits of posts/ threads	25/8/2019	hatshepsut93	sums & displays all merits of a post	7+
Display username at 1st position in list of merit senders of posts/threads	26/8/2019	hatshepsut93	Displays username and total sent-merits at first	1+
Display total sent/ received merits last 120 days on user merit stat page (v.0.2) *	01/11/2019	TryNinja	Users' merit stats	2+
Sort by merit in the anniversary art contest?	22/10/2019	hatshepsut93	Anniversary art contest's merit stats	14+
Automatically append ;dt to the end of URLs (View as DT) [v0.2.3]	13/1/2019	DarkStar_	a "View as DefaultTrust" option	24+
Tampermonkey script to block ignored users	29/07/2016	ColderThanIce	Hides the field area for ignored users	0
Bitcointalk Watchlist Watchdog	17/10/2016	LsHallo	Displays the # of unread posts	0
A script to count the number of symbols in a message	07/02/2018	DimNik	Character counter	0
[RELEASED] @mention notification bot - now with Telegram	07/09/2018	Piggy	Notification bot for forum/telegram	321
babo btctalk bar - v1.1	10/12/2019	babo	Fast archive is, url shortener, etc.	10+
[TelegramBot] Merit watcher (check every 5 mins)	12/12/2019	giammangiato	Merit notifications	33+
Script to Change Bitcointalk Background Color	21/12/2019	DroomieChikito	The forum's background	4+
Self Moderator Bot	15/12/2019	PrimeNumber7	To ban UIDs in self-moderated thread	30+
[TELEGRAM BOT] Merit, Trust List, etc.	09/02/2020	GreatArkansas	Information bot for bitcointalk such as merits, trust list, more in the future.	43+
A kinda shitty script for quoting posts in locked topics	18/02/2020	minifrij	userscript for quoting posts in locked topics	22+
Another BitcoinTalk Notification BOT (merits, mentions, topics,+)	16/05/2020	TryNinja	A telegram bot	131+
custom your bitcointalk header and profile page [css only]	14/08/2020	0x256	Forum theme	13+
Instant Profile & Unedited posts Displayer v0.11	06/09/2020	Aveatrex	Forum theme	15+
Hide user profile icons	02/01/2023	TryNinja	Userscript	31+
Skipping to the next/previous post within a topic by the same author	13/10/2022	PowerGlove	SMF patch	52+
Member filtering widget [◇/◈]	30/10/2022	PowerGlove	SMF patch	60+
Should the difference in size between normal and quoted text be smaller?	27/11/2022	PowerGlove	SMF patch	22+
Post history (action=profile;sa=showPosts) sometimes renders code too wide	04/01/2023	PowerGlove	SMF patch	194+
Adding [nbsp] (non-breaking space) to the BBCode parser	20/02/2023	PowerGlove	SMF patch	51+
Making new messages more obvious	11/04/2023	PowerGlove	SMF patch	48+
Copy button next to content in code command	28/04/2023	TryNinja	Userscript	3+
A concise 2FA/TOTP implementation	23/6/2023	PowerGlove	SMF patch	240+
Cleaning up the glow tag	16/8/2023	PowerGlove	SMF patch	26+
Decoupling message IDs from topic IDs	23/8/2023	PowerGlove	SMF patch	210+
Improving the auto-linker	07/9/2023	PowerGlove	SMF patch	35+
Encouraging non-lazy PM subjects	18/9/2023	PowerGlove	SMF patch	7+
Topic title RTL weirdness	02/10/2023	PowerGlove	SMF patch	26+
Automatically delete/ edit all bitcointalk posts	07/10/2023	SwayStar123	Python script	17+
A concise 2FA/TOTP implementation *	23/06/2023	PowerGlove	SMF patch	450+
Auto-Save your posts to drafts	07/01/2024	TryNinja	Userscript	3+
A copy button for [code] blocks (SMF patch)	19/2/2024	PowerGlove	SMF patch	31+
Show number (new replies to your posts)	08/03/2024	0x256	Userscript	1+
Identifying the linked-to post in a topic	04/04/2024	PowerGlove	SMF patch	50+
Warning against consecutive posts	13/05/2024	PowerGlove	SMF patch	50+
Quoting from locked threads	10/06/2024	PowerGlove	SMF patch	3+
_____________________________________________________________________	________	___________	___________________________	______

* actively updated
*: This SMF patch is added (see this announcement) on December 21, 2023 by theymos.

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Github

• https://github.com/Tiramisu77/bct-userscripts: hatshepsut93

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Dead projects:

Topics	Date	written by	Section	Merit
_____________________________________________________________________	________	___________	___________________________	______
Automatic URL shortener for bitcointalk posts	22/02/2018	EcuaMobi	URL	6+
BPIP.org Chrome & FireFox Extension	27/9/2018	Initscri	BPIP.org extension	34+
_____________________________________________________________________	________	___________	___________________________	______

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Form to suggest new Userscripts:

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Credits: I use the table form from 1miau's topic.
Everyone have intention to use any of those userscripts/ extensions should accept risks themselves. Even those ones listed here published by well-known users, it does not guarentee that you have zero risk when using them.

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Related GUIDES
How to change the appearance of Bitcointalk to dark (Dark Theme)? (written by wwzsocki)

If it is truly what Wisepass provides to its users, it is very great.
From now on, Wisepass users can use TOMO coins to buy vouchers in Wisepass app, and they even don't have to bring paper vouchers around for drinking, eating food, shopping, and so many things in their lives. It sounds that Wisepass and TOMOchain will bring more comfortable, convenient, and better life experience to human civilzation with its apps and blockchain technology.
What an impressive statistic on total download count for such young app!

Whole market has turned into Red, instead of Green as we saw within last few weeks.
Litecoin has fallen around 4 percent and currently stood at 0.0167 BTC per LTC, less fallen than other altcoins.
However, I believed that eventually the market has to correct in massive scale, after days increased in massive scale.Waited a bit for more corrections and fill your bag with more cheaper Litecoin might be better. Anyway, you will be save with your long term investment perspective.

In any aspect, time is neccessary thing to get experience. For trading, you can not simply learn Fundamental or Technical Analytical Techniques, the jump directly to trade and win from time to time.
Traders, even smart traders, need to spend their time (around 3 years) to get enough experience as well as practice their ability to control emotions, and patience to get succesful tradings.
Nope, I don't think it is a bull trap, instead it is a real bull market.
However, it seems that the market has to been corrected somehow. We all know that market has to correct, but sometimes our greediness force us to make stupid orders.
It raised with reasons behind, not without reason, my friend. Bitcoin bottomed out, and the halving to come next year are main reasons.

Bear went away, the Bull already come, but after amazingly significant growths recent weeks, the market will have to call into sideway period. The period of sideways (with some ups and downs) might last long, maybe it will last for months before the next accumulation phase finish.
After that, we might see another big wave like we saw recent weeks. I still thought positive about the rally of market this year, but it takes time for market to move up to its new higher level

The whole market has fallen into correction phase, and no one knows how long will the correction wave last. I guess the correction wave of crypto, including Ethereum might last till the end of this month before something big suddenly appear. Moreover, who knows next sudden movements of crypto, especially bitcoin and ethereum, are upwards or downwards. Let's obsever to see how long the corrections last and next dramatic moves.

I thought that if momentum maintains well, Dogecoin can setup its new supports around 60 satoshis.
So, after the April 1st passed, the rises of Dogecoin yesterday were real ones.
It is a big surprise because I followed Dogecoin for weeks, and it did not shown technical indicators for such considerable rises.

I like it, double fund to bet from capital.
And, it will last more than a week, very good time to enjoy football game with double bets.
Maybe posted on wrong topic. Lottery game on FJ. 

Greediness is one of human basic instinct, but it need to have triggering causal factors, such as FOMO, Moon.
So, I think that promised predictions on huge profits will make them go crazy.
Such as when market turn moving up well, and when bitcoin hit $50.000, for instance, they will go crazy and accept to buy bitcoin at any price on market. They think they should hurry as much as possible to get profits.

Bull has been here, in front of your computer screens. The question for now should be how long the bull will stay here, and when bear come back? Enjoy weeks with bull everyone. In my opinion, bull might not stay too long, but long enough to enjoy its ride. Bitcoin and crypto market won't be able to jump into Bullish phase this year, they might only have bumping times along the journey this year, no thing more than bumping. Bull, what we all expected for, might only come in next year.

Sure about that.
Let's do simple calculation I shown above.
In marketcap, ETH is 1.13 times bigger than XRP.
In daily volume, ETH is 5.88 times bigger than XRR.
Which one is the king of altcoins?
 

It is totally true, especially for the young generations, they always like modern graphic designs.
They will skip sites fastly if they don't have interests in sites' UI at the first glance.
Next, they might spend their time to discover games, features, functionalities on those sites.
In such competitive industry, it is difficult to survive and competitive with others with poor UIs at the start.

The king of altcoins, I think it is easy to answer:
Please look at this:
Rank (in total marketcap), and volume: https://coinmarketcap.com/
Ethereum and Ripple has stood at the second and third positions, respectively.
Total marketcap of ETH and XRP are $14.6 bil. and $12.9 bil

However, total volume last 24 hours of ETH and XRP are $4.8 bil. and $816 mil.
You know what I meant?
ETH is obviously the king of altcoins.

dump or pump on cryptopia does not make sense till the day the exchange fully enable all of its features.
Deposits, and withdrawals should be reenabled to make the exchange fully come back.
For now, all losses on the one are likely paper losses, all wins are likely paper wins because you can not withdraw your money out.

If bitcoin can not hit its new all time high next months or years, it will make people go to crazy if bitcoin fall to nearly zero, or be a dead one.
There are so many fraud accusation on bitcoin, and dead declaration on bitcoin, but by now, bitcoin has been here, survived well, not dead, and it might have a bright future to come, instead of fraud and dead.

Most of altcoins are shit coins as well as most of tokens are shit tokens. So, be careful and hesitated a little bit before clicking orders to buy and invest is important. For good projects, holding will help investors survive thorough crashes and get profits for their long holding time. However, it is totally contrast for shit projects, shit altcoins, and shit tokens. Holding longer, bigger losses.

The crypto market made people (small part in human society, because there are still insignificant crypto investors) went crazy at least two times.
First one occured in 2013.
Second one occured in 2017.
So, will you think that we might see the third one?
I am readily to go crazy one more time with crypto.

Instructions are one of utmost things to read before creating accounts or playing.
So, you recommended valueable, and right things who have interests to join the Challenge above.
It seems that gamblers should do opposite bets in mirror of decimal places, not sure that will increase odds to win the challenge.

On so many medial channels, famous crypto sites, twitter, facebook, or even traditional journals, lots of statements that bitcoin has nearly found its bottom, and has almost finished to set up its strong supports around $4k. Therefore, the emotions and believes of investors tend to be strengthened a little bit, they felt much better last month. So, if the bitcoin can maintain its supports and get moving up, investors who cashed out months ago, might come back to re-invest into crypto. When they decide to reinvest, they will do it not only into bitcoin, but also into altcoins, including our Litecoin.

My advice is:
Dedicating computer or laptop (not mobile devices), that only be used of only limited purposes:
- Using your bitcointalk account.
- Trading on well known exchanges.
- Downloading, installing wallets from well known coins from official websites.
- Preparing Internet Security softwares (still have active license key).
That's all you need to protect your computers.