Код:

<style>
    .category-info .tc2:before {
        content: 'Тем: ';
    }
    .category-info .tc3:before {
        content: 'Постов: ';
    }
    .category thead {
        display: none;
    }
    
    .category .tc2, .category .tc3, .category .tcr, .category .tcl .tclcon {
        display: none;
    }
    .punbb .main .category-info > * {
        width: auto;
        text-align: left;
    }

    .category tr {
        display: inline-block;
    }
    
    .category-info {
        background: aliceblue;
        padding: .5em;
        z-index: 9999;
        display: none;
    }
    .category-info.visible {
        display: block;
    }
</style>

Код:

<script>
        const hint = document.createElement('div');
        hint.classList.add('category-info');
        const main = document.querySelector('#pun-main');
        main.append(hint);
        document.querySelectorAll('.category tbody tr').forEach(el => {
            el.querySelector('.tcl').addEventListener('mouseenter', (e) => {
                hint.innerHTML = '';
                hint.classList.add('visible');
                const hintContent = [];
                el.querySelectorAll('.tc2, .tc3, .tcr, .tcl .tclcon')
                    .forEach(cell => {
                        const newEl = document.createElement('div');
                        newEl.innerHTML = cell.innerHTML;
                        newEl.className = cell.className;
                        hintContent.push(newEl);
                    });
                hint.append(...hintContent);
                hint.style.position = 'fixed';
                const {left, top, height} = el.getBoundingClientRect();
                hint.style.top = (top + height) + 'px';
                hint.style.left = left + 'px';
                main.addEventListener('mouseleave', (ev) => {hint.innerHTML = '';hint.classList.remove('visible')});
            });
        });
</script>

Код:

<script>
    const piarTopicsPrefix = '[Реклама]'; //начало названия топиков, в которых будет форма
    const piarForumId = '5'; //id форума, в котором лежат топики, в которых будет форма
    const isPiarTopic = FORUM.topic?.subject.startsWith(piarTopicsPrefix) && FORUM.topic?.forum_id === piarForumId;
    if (location.pathname === '/viewtopic.php' && isPiarTopic) {
        const saveToLS = (data) => localStorage.setItem('pr_values', JSON.stringify(data));
        const getFromLS = () => JSON.parse(localStorage.getItem('pr_values') || "false");
        const removeFromLS = () => localStorage.removeItem('pr_values');
        if (GroupID === 3){
            const piarLogin = 'Пиарщик?'; //логин пиар-аккаунта
            const piarPassword = '111111'; //пароль пиар-аккаунта
            let linkError = '';
            let codeError = '';
            const validateFields = (fields) => true;
            const markup = `
            <div id='piar_reply_emulator' class='container'>
                <form>
                    <fieldset>
                        <legend>Разместить рекламу</legend>
                        <p style="display: grid; grid-template-columns: 1fr;"${linkError ? " class=has-error" : ""}>
                	<label for="our_piar_link">Ссылка на ответную рекламу</label>
                	${linkError}
                	<input type="text" id="our_piar_link" name="our_piar_link">
                </p>
                
                        <p${codeError ? " class=has-error" : ""}>
                	<label for="your_piar_code">Код вашей рекламы</label><br>
                	${codeError}
                	<textarea id="your_piar_code" name="your_piar_code" rows="13"></textarea>
                </p>
            </fieldset>
                    <p><input type="submit"></p>
                </form>
            </div>`;
            const bottomPagination = document.querySelector('.linksb');
            bottomPagination.insertAdjacentHTML('afterend', markup);
            const piarReplyEmulatorForm = bottomPagination.nextElementSibling.querySelector('form');
            piarReplyEmulatorForm.addEventListener('submit', async (ev) => {
                ev.preventDefault();
                const values = {};
                for(let elem of piarReplyEmulatorForm){
                    if(['text', 'textarea'].includes(elem.type))
                    values[elem.name] = elem.value || ''
                }
                
                if (!validateFields(values)) return false;
                saveToLS(values);
                const loginFormMarkup = `
                <form id="login" class="container" method="post" action="https://vpomoike.mybb.ru/login.php?action=in" onsubmit="return true">
            <input type="hidden" name="form_sent" value="1">
            <input type="hidden" name="redirect_url" value="${window.location.href}">
            <input type="text" id="fld1" name="req_username" size="25" maxlength="25" value="${piarLogin}">
            <input type="password" id="fld2" name="req_password" size="16" maxlength="16" value="${piarPassword}">
        </form>`;
            const container = document.createElement('div');
            container.innerHTML = loginFormMarkup;
            document.querySelector('body').append(container);
                const event = new Event("submit");
                container.querySelector('form').submit();
            })
        } else {
            const pr_data = getFromLS();
            if(pr_data) {
                document.querySelector('#main-reply').value = `
${pr_data.your_piar_code}

[b]Ваша:[/b] ${pr_data.our_piar_link}`.trim();
                removeFromLS();
                document.querySelector('#post-form #post').submit?.click()
                const logoutUrl = `${document.location.origin}/login.php?action=out&id=${window.UserID}`
                fetch(logoutUrl);
            }
        }
    }
</script>